Vietnam 
English 
Japan 
Korea 
China 
Indonesia 
Thailand 
Welds are an important "bridge" in steel structures, ensuring a solid connection between components. However, during the welding process, welds cannot avoid defects, affecting the durability and safety of the project. Therefore, checking steel structure welds is extremely important, helping to detect errors early and have timely treatment measures.
1. Why is it necessary to inspect structural steel welds?
Steel structure weld inspection plays an important role in:
- Ensuring construction quality: Detecting weld defects to ensure the quality and life of the construction.
- Preventing risks: Minimizing the risk of incidents and accidents due to faulty welds.
- Saving costs: Early detection of defects for timely repair measures, avoiding costly repairs later.
- Compliance with regulations: Meeting standards and regulations on weld quality inspection.
3. Common Methods of Inspection of Steel Structural Welds
There are many different methods of inspecting structural steel welds, each with its own advantages and disadvantages. Here are some common methods:
2.1. Visual Testing (VT)
Visual inspection of welds
- Advantages: Simple, fast, inexpensive.
- Disadvantages: Only detects surface defects.
- Applications: This method can measure weld height, shape and appearance of the external weld.
2.2. Magnetic Particle Testing (MT)
Magnetic welding inspection
- Magnetic Particle Testing (MT) is a method based on the interaction between magnetic fields and magnetic particles. When there is a defect on the surface of the material, the distribution of the magnetic field will change, and the magnetic particles will concentrate at that location, helping to detect the defect. This method is applied to magnetic materials that can detect even very small surface cracks, subsurface defects. Detectable defects include: surface cracks in welds and heat-affected zones, insufficient melting, subsurface cracks, etc.
- By this method, a minimum gap width of about 1mm can be detected when the minimum depth is 10mm and the minimum gap length is about 0.2–1mm.
- This method will test fillet welds such as column, truss, beam, stiffener code welds, and connection code welds.
2.3. Ultrasonic Testing (UT)
Ultrasonic testing (UT) is a non-destructive method used to evaluate the quality of welds. By using ultrasonic waves, defects within the material can be detected without disturbing its structure.
Ultrasonic weld inspection
This method will check the welds of the wing joints, the belly joints of the columns, beams and trusses with a thickness of 8mm or more.
- Advantages: Detecting defects inside the weld, such as cracks, air holes, lack of fusion...
- Disadvantages: Requires high technical skills, requires experienced people.
- Application: Checking the quality of welds in important structures.
2.4. Penetrant Testing (PT)
Penetrant Testing (PT)
This is a non-destructive weld inspection method used to detect exposed discontinuities on the surface of any industrial product made from non-porous materials. The penetrant weld inspection method is commonly used to inspect non-magnetic materials. In this method, a liquid penetrant is sprayed onto the surface of the product for a certain period of time, after which the excess penetrant is removed from the surface. The surface is then dried and coated with a developer. The penetrant that has penetrated into cracks or cavities is "absorbed" by the developer, creating marks (indicators) indicating the location and size of the defect.
3. Choosing the Right Testing Method
Choosing the appropriate method of testing structural steel welds depends on many factors, such as:
- Material type: Normal steel, alloy steel, magnetic material...
- Weld type: Fillet weld, butt weld, T-weld...
- Quality requirements: Welds for normal structures or important structures.
- Inspection cost: Each method has a different cost.
Steel structure weld inspection is an important and indispensable step in the construction and acceptance process of the project. Choosing the appropriate inspection method and following the correct procedure will help ensure the quality and safety of the project. During the production process, Seico always adheres to the standards with a team of skilled welders, certified according to regulations to bring the best quality steel structures to the projects. If you need more information about steel structures and pre-engineered steel buildings, please contact Seico for free consultation.
Welds are an important "bridge" in steel structures, ensuring a solid connection between components. However, during the welding process, welds cannot avoid defects, affecting the durability and safety of the project. Therefore, checking steel structure welds is extremely important, helping to detect errors early and have timely treatment measures.
1. Why is it necessary to inspect structural steel welds?
Steel structure weld inspection plays an important role in:
- Ensuring construction quality: Detecting weld defects to ensure the quality and life of the construction.
- Preventing risks: Minimizing the risk of incidents and accidents due to faulty welds.
- Saving costs: Early detection of defects for timely repair measures, avoiding costly repairs later.
- Compliance with regulations: Meeting standards and regulations on weld quality inspection.
3. Common Methods of Inspection of Steel Structural Welds
There are many different methods of inspecting structural steel welds, each with its own advantages and disadvantages. Here are some common methods:
2.1. Visual Testing (VT)
Visual inspection of welds
- Advantages: Simple, fast, inexpensive.
- Disadvantages: Only detects surface defects.
- Applications: This method can measure weld height, shape and appearance of the external weld.
2.2. Magnetic Particle Testing (MT)
Magnetic welding inspection
- Magnetic Particle Testing (MT) is a method based on the interaction between magnetic fields and magnetic particles. When there is a defect on the surface of the material, the distribution of the magnetic field will change, and the magnetic particles will concentrate at that location, helping to detect the defect. This method is applied to magnetic materials that can detect even very small surface cracks, subsurface defects. Detectable defects include: surface cracks in welds and heat-affected zones, insufficient melting, subsurface cracks, etc.
- By this method, a minimum gap width of about 1mm can be detected when the minimum depth is 10mm and the minimum gap length is about 0.2–1mm.
- This method will test fillet welds such as column, truss, beam, stiffener code welds, and connection code welds.
2.3. Ultrasonic Testing (UT)
Ultrasonic testing (UT) is a non-destructive method used to evaluate the quality of welds. By using ultrasonic waves, defects within the material can be detected without disturbing its structure.
Ultrasonic weld inspection
This method will check the welds of the wing joints, the belly joints of the columns, beams and trusses with a thickness of 8mm or more.
- Advantages: Detecting defects inside the weld, such as cracks, air holes, lack of fusion...
- Disadvantages: Requires high technical skills, requires experienced people.
- Application: Checking the quality of welds in important structures.
2.4. Penetrant Testing (PT)
Penetrant Testing (PT)
This is a non-destructive weld inspection method used to detect exposed discontinuities on the surface of any industrial product made from non-porous materials. The penetrant weld inspection method is commonly used to inspect non-magnetic materials. In this method, a liquid penetrant is sprayed onto the surface of the product for a certain period of time, after which the excess penetrant is removed from the surface. The surface is then dried and coated with a developer. The penetrant that has penetrated into cracks or cavities is "absorbed" by the developer, creating marks (indicators) indicating the location and size of the defect.
3. Choosing the Right Testing Method
Choosing the appropriate method of testing structural steel welds depends on many factors, such as:
- Material type: Normal steel, alloy steel, magnetic material...
- Weld type: Fillet weld, butt weld, T-weld...
- Quality requirements: Welds for normal structures or important structures.
- Inspection cost: Each method has a different cost.
Steel structure weld inspection is an important and indispensable step in the construction and acceptance process of the project. Choosing the appropriate inspection method and following the correct procedure will help ensure the quality and safety of the project. During the production process, Seico always adheres to the standards with a team of skilled welders, certified according to regulations to bring the best quality steel structures to the projects. If you need more information about steel structures and pre-engineered steel buildings, please contact Seico for free consultation.
Welds are an important "bridge" in steel structures, ensuring a solid connection between components. However, during the welding process, welds cannot avoid defects, affecting the durability and safety of the project. Therefore, checking steel structure welds is extremely important, helping to detect errors early and have timely treatment measures.
1. Why is it necessary to inspect structural steel welds?
Steel structure weld inspection plays an important role in:
- Ensuring construction quality: Detecting weld defects to ensure the quality and life of the construction.
- Preventing risks: Minimizing the risk of incidents and accidents due to faulty welds.
- Saving costs: Early detection of defects for timely repair measures, avoiding costly repairs later.
- Compliance with regulations: Meeting standards and regulations on weld quality inspection.
3. Common Methods of Inspection of Steel Structural Welds
There are many different methods of inspecting structural steel welds, each with its own advantages and disadvantages. Here are some common methods:
2.1. Visual Testing (VT)
Visual inspection of welds
- Advantages: Simple, fast, inexpensive.
- Disadvantages: Only detects surface defects.
- Applications: This method can measure weld height, shape and appearance of the external weld.
2.2. Magnetic Particle Testing (MT)
Magnetic welding inspection
- Magnetic Particle Testing (MT) is a method based on the interaction between magnetic fields and magnetic particles. When there is a defect on the surface of the material, the distribution of the magnetic field will change, and the magnetic particles will concentrate at that location, helping to detect the defect. This method is applied to magnetic materials that can detect even very small surface cracks, subsurface defects. Detectable defects include: surface cracks in welds and heat-affected zones, insufficient melting, subsurface cracks, etc.
- By this method, a minimum gap width of about 1mm can be detected when the minimum depth is 10mm and the minimum gap length is about 0.2–1mm.
- This method will test fillet welds such as column, truss, beam, stiffener code welds, and connection code welds.
2.3. Ultrasonic Testing (UT)
Ultrasonic testing (UT) is a non-destructive method used to evaluate the quality of welds. By using ultrasonic waves, defects within the material can be detected without disturbing its structure.
Ultrasonic weld inspection
This method will check the welds of the wing joints, the belly joints of the columns, beams and trusses with a thickness of 8mm or more.
- Advantages: Detecting defects inside the weld, such as cracks, air holes, lack of fusion...
- Disadvantages: Requires high technical skills, requires experienced people.
- Application: Checking the quality of welds in important structures.
2.4. Penetrant Testing (PT)
Penetrant Testing (PT)
This is a non-destructive weld inspection method used to detect exposed discontinuities on the surface of any industrial product made from non-porous materials. The penetrant weld inspection method is commonly used to inspect non-magnetic materials. In this method, a liquid penetrant is sprayed onto the surface of the product for a certain period of time, after which the excess penetrant is removed from the surface. The surface is then dried and coated with a developer. The penetrant that has penetrated into cracks or cavities is "absorbed" by the developer, creating marks (indicators) indicating the location and size of the defect.
3. Choosing the Right Testing Method
Choosing the appropriate method of testing structural steel welds depends on many factors, such as:
- Material type: Normal steel, alloy steel, magnetic material...
- Weld type: Fillet weld, butt weld, T-weld...
- Quality requirements: Welds for normal structures or important structures.
- Inspection cost: Each method has a different cost.
Steel structure weld inspection is an important and indispensable step in the construction and acceptance process of the project. Choosing the appropriate inspection method and following the correct procedure will help ensure the quality and safety of the project. During the production process, Seico always adheres to the standards with a team of skilled welders, certified according to regulations to bring the best quality steel structures to the projects. If you need more information about steel structures and pre-engineered steel buildings, please contact Seico for free consultation.
Welds are an important "bridge" in steel structures, ensuring a solid connection between components. However, during the welding process, welds cannot avoid defects, affecting the durability and safety of the project. Therefore, checking steel structure welds is extremely important, helping to detect errors early and have timely treatment measures.
1. Why is it necessary to inspect structural steel welds?
Steel structure weld inspection plays an important role in:
- Ensuring construction quality: Detecting weld defects to ensure the quality and life of the construction.
- Preventing risks: Minimizing the risk of incidents and accidents due to faulty welds.
- Saving costs: Early detection of defects for timely repair measures, avoiding costly repairs later.
- Compliance with regulations: Meeting standards and regulations on weld quality inspection.
3. Common Methods of Inspection of Steel Structural Welds
There are many different methods of inspecting structural steel welds, each with its own advantages and disadvantages. Here are some common methods:
2.1. Visual Testing (VT)
Visual inspection of welds
- Advantages: Simple, fast, inexpensive.
- Disadvantages: Only detects surface defects.
- Applications: This method can measure weld height, shape and appearance of the external weld.
2.2. Magnetic Particle Testing (MT)
Magnetic welding inspection
- Magnetic Particle Testing (MT) is a method based on the interaction between magnetic fields and magnetic particles. When there is a defect on the surface of the material, the distribution of the magnetic field will change, and the magnetic particles will concentrate at that location, helping to detect the defect. This method is applied to magnetic materials that can detect even very small surface cracks, subsurface defects. Detectable defects include: surface cracks in welds and heat-affected zones, insufficient melting, subsurface cracks, etc.
- By this method, a minimum gap width of about 1mm can be detected when the minimum depth is 10mm and the minimum gap length is about 0.2–1mm.
- This method will test fillet welds such as column, truss, beam, stiffener code welds, and connection code welds.
2.3. Ultrasonic Testing (UT)
Ultrasonic testing (UT) is a non-destructive method used to evaluate the quality of welds. By using ultrasonic waves, defects within the material can be detected without disturbing its structure.
Ultrasonic weld inspection
This method will check the welds of the wing joints, the belly joints of the columns, beams and trusses with a thickness of 8mm or more.
- Advantages: Detecting defects inside the weld, such as cracks, air holes, lack of fusion...
- Disadvantages: Requires high technical skills, requires experienced people.
- Application: Checking the quality of welds in important structures.
2.4. Penetrant Testing (PT)
Penetrant Testing (PT)
This is a non-destructive weld inspection method used to detect exposed discontinuities on the surface of any industrial product made from non-porous materials. The penetrant weld inspection method is commonly used to inspect non-magnetic materials. In this method, a liquid penetrant is sprayed onto the surface of the product for a certain period of time, after which the excess penetrant is removed from the surface. The surface is then dried and coated with a developer. The penetrant that has penetrated into cracks or cavities is "absorbed" by the developer, creating marks (indicators) indicating the location and size of the defect.
3. Choosing the Right Testing Method
Choosing the appropriate method of testing structural steel welds depends on many factors, such as:
- Material type: Normal steel, alloy steel, magnetic material...
- Weld type: Fillet weld, butt weld, T-weld...
- Quality requirements: Welds for normal structures or important structures.
- Inspection cost: Each method has a different cost.
Steel structure weld inspection is an important and indispensable step in the construction and acceptance process of the project. Choosing the appropriate inspection method and following the correct procedure will help ensure the quality and safety of the project. During the production process, Seico always adheres to the standards with a team of skilled welders, certified according to regulations to bring the best quality steel structures to the projects. If you need more information about steel structures and pre-engineered steel buildings, please contact Seico for free consultation.
Mối hàn là "cầu nối" quan trọng trong kết cấu thép (KCT), đảm bảo sự liên kết vững chắc giữa các cấu kiện. Tuy nhiên, trong quá trình hàn, mối hàn không thể tránh khỏi những khuyết khuyết tật, ảnh hưởng đến độ bền và an toàn của công trình. Vì vậy, việc kiểm tra mối hàn KCT là vô cùng quan trọng, giúp phát hiện sớm các lỗi và có biện pháp xử lý kịp thời.
1. Tại Sao Cần Kiểm Tra Mối Hàn KCT?
Kiểm tra mối hàn KCT đóng vai trò quan trọng trong việc:
- Đảm bảo chất lượng công trình: Phát hiện các khuyết tật của mối hàn để đảm bảo chất lượng và tuổi thọ của công trình.
- Ngăn ngừa rủi ro: Giảm thiểu nguy cơ xảy ra sự cố, tai nạn do mối hàn bị lỗi.
- Tiết kiệm chi phí: Phát hiện sớm các lỗi để có biện pháp sửa chữa kịp thời, tránh tốn kém chi phí khắc phục về sau.
- Tuân thủ quy định: Đáp ứng các tiêu chuẩn và quy định về kiểm tra chất lượng mối hàn.
3. Các Phương Pháp Kiểm Tra Mối Hàn KCT Phổ Biến
Có nhiều phương pháp kiểm tra mối hàn KCT khác nhau, mỗi phương pháp có ưu và nhược điểm riêng. Dưới đây là một số phương pháp phổ biến:
2.1. Kiểm tra ngoại dạng bằng mắt (VT)
Kiểm tra mối hàn bằng mắt
- Ưu điểm: Đơn giản, nhanh chóng, không tốn kém.
- Nhược điểm: Chỉ phát hiện các khuyết tật trên bề mặt.
- Ứng dụng: Phương pháp này có thể đo chiều cao mối hàn, hình dáng và ngoại dạng mối hàn bên ngoài.
2.2. Kiểm tra mối hàn bằng phương pháp từ tính (MT)
Kiểm tra mối hàn bằng phương pháp từ tính
- Kiểm tra hạt từ (MT) là một phương pháp NDT dựa trên hiện tượng tương tác giữa từ trường và các hạt từ tính. Khi có khuyết tật trên bề mặt vật liệu, sự phân bố của từ trường sẽ bị thay đổi, và các hạt từ tính sẽ tập trung tại vị trí đó, giúp phát hiện khuyết tật. Phương pháp này được áp dụng cho các vật liệu từ tính có thể phát hiện các rạn nứt bề mặt dù rất nhỏ, các khuyết tật ở dưới bề mặt. Các khuyết tật có thể phát hiện bao gồm: rạn nứt bề mặt ở mối hàn và vùng ảnh hưởng nhiệt, sự nóng chảy không đủ, các rạn nứt phía dưới bề mặt,...
- Bằng phương pháp này có thể phát hiện độ rộng khe hở tối thiểu khoảng 1mm khi độ sâu tối thiểu là 10mm và chiều dài khe hở tối thiểu khoảng 0,2–1 mm.
- Phương pháp này sẽ kiểm tra các mối hàn góc như mối hàn tổ hợp cột, kèo, dầm, mối hàn mã tăng cứng, mã liên kết.
2.3. Kiểm tra siêu âm mối Hàn (UT)
Kiểm tra siêu âm (UT) là một phương pháp không phá hủy được sử dụng để đánh giá chất lượng mối hàn. Bằng cách sử dụng sóng siêu âm, các khuyết tật bên trong vật liệu có thể được phát hiện mà không làm ảnh hưởng đến cấu trúc của nó.
Kiểm tra mối hàn bằng máy siêu âm
Phương pháp này sẽ kiểm tra các đường hàn nối cánh, nối bụng cột kèo dầm có chiều dày từ 8mm trở lên.
- Ưu điểm: Phát hiện các khuyết tật bên trong mối hàn, như nứt, rỗ khí, không ngấu...
- Nhược điểm: Yêu cầu kỹ thuật cao, cần người có kinh nghiệm.
- Ứng dụng: Kiểm tra chất lượng mối hàn trong các kết cấu quan trọng.
2.4. Kiểm tra thẩm thấu
Kiểm tra thẩm thấu
Đây là một phương pháp kiểm tra mối hàn không phá hủy được áp dụng để phát hiện những bất liên tục hở ra trên bề mặt vật liệu, của bất cứ sản phẩm công nghiệp nào được chế tạo từ những vật liệu không xốp. Phương pháp kiểm tra mối hàn bằng chất thẩm thấu được sử dụng phổ biến để kiểm tra những vật liệu không từ tính. Trong phương pháp này, chất thấm lỏng được phun lên bề mặt của sản phẩm trong một thời gian nhất định, sau đó phần chất thấm còn dư được loại bỏ khỏi bề mặt. Bề mặt sau đó được làm khô và phủ chất hiện lên đó. Chất thấm đã ngấm vào các vết nứt hoặc lỗ hổng sẽ bị chất hiện "hút" lên, tạo thành các dấu hiệu (chỉ thị) cho biết vị trí và kích thước của lỗi.
3. Lựa Chọn Phương Pháp Kiểm Tra Phù Hợp
Việc lựa chọn phương pháp kiểm tra mối hàn KCT phù hợp phụ thuộc vào nhiều yếu tố, như:
- Loại vật liệu: Thép thường, thép hợp kim, vật liệu từ tính...
- Loại mối hàn: Mối hàn góc, mối hàn đối đầu, mối hàn chữ T...
- Yêu cầu chất lượng: Mối hàn cho kết cấu thông thường hay kết cấu quan trọng.
- Chi phí kiểm tra: Mỗi phương pháp có chi phí khác nhau.
Kiểm tra mối hàn KCT là một công đoạn quan trọng, không thể thiếu trong quá trình thi công và nghiệm thu công trình. Việc lựa chọn phương pháp kiểm tra phù hợp và tuân thủ đúng quy trình sẽ giúp đảm bảo chất lượng và an toàn cho công trình. Trong quá trình sản xuất, Seico luôn tuân thủ theo các tiêu chuẩn với đội ngũ thợ hàn lành nghề, đạt chứng chỉ theo quy định để mang đến chất lượng kết cấu thép tốt nhất cho các công trình. Quý khách hàng cần thêm thông tin về kết cấu thép, nhà thép tiền chế vui lòng liên hệ Seico để nhận tư vấn miễn phí.
March 8th is an opportunity to celebrate the beauty and strength of women. Seico is proud to have talented, strong-willed, and passionate women in life and at work. Wishing all the ladies to always be beautiful, happy, and successful in every aspect. In the construction industry, we see more and more talented women, making significant contributions to the development of projects. Seico extends its deepest gratitude to the resilient 'rose blossoms' who always strive to build solid structures.
March 8th is an opportunity to celebrate the beauty and strength of women. Seico is proud to have talented, strong-willed, and passionate women in life and at work. Wishing all the ladies to always be beautiful, happy, and successful in every aspect. In the construction industry, we see more and more talented women, making significant contributions to the development of projects. Seico extends its deepest gratitude to the resilient 'rose blossoms' who always strive to build solid structures.