Effect of welding structure on weldability of weld metal
Release time:
2022-12-04
【Summary Description】 Structural factors. Structural factors include the form, stiffness, and stress state of welded structures and welded joints,. These will affect the mechanical properties of the joint, resulting in welding defects. For the size and weight of the required welding structure, the design should choose higher than the strength of the material (such as light alloy material), in order to achieve the purpose of reducing the volume and weight. For welded structures with no special requirements for volume and weight, the selection of materials with higher strength level also has technical and economic significance, which can reduce the weight of the structure, save the base material and Welding materials, avoid the difficulty of hoisting and transportation of large structures, and improve the bearing capacity. The structural design of the welded joint affects the stress state and thus the weldability. In the design, the stress at the joint should be kept in a small state and can shrink freely, which is conducive to reducing stress concentration and preventing welding cracks. Try to avoid gaps at the joint, sudden changes in cross-section, excessive height, cross-welds, etc. This easily causes stress concentration. It is also necessary to avoid unnecessarily increasing the thickness of the base metal or the volume of the weld to produce multidirectional stresses. Welding heat source characteristics, power density, line energy and other process parameters will directly determine the temperature field and thermal cycle of the joint, which will have a significant impact on the size of the weld and heat affected zone, tissue changes, defect sensitivity and so on. For example, preheating before welding and slow cooling after welding can reduce the cooling rate of the joint, which can reduce the hardening tendency and cold crack sensitivity of the joint. Choosing a reasonable welding sequence can improve the constraint degree and profitability of the structure. Using argon arc welding and other welding methods, the welding area can be closely protected, reduce the burning loss of alloy elements, and obtain satisfactory joint performance.
structural factors.
Structural factors include the form, stiffness, and stress state of welded structures and welded joints,.
These will affect the mechanical properties of the joint, resulting in welding defects.
For the size and weight of the required welding structure, the design should choose higher than the strength of the material (such as light alloy material), in order to achieve the purpose of reducing the volume and weight. For welded structures with no special requirements for volume and weight, the selection of materials with higher strength level also has technical and economic significance, which can reduce the weight of the structure, save the base material and Welding materials, avoid the difficulty of hoisting and transportation of large structures, and improve the bearing capacity.
The structural design of the welded joint affects the stress state and thus the weldability. In the design, the stress at the joint should be kept in a small state and can shrink freely, which is conducive to reducing stress concentration and preventing welding cracks. Try to avoid gaps at the joint, sudden changes in cross-section, excessive height, cross-welds, etc. This easily causes stress concentration. It is also necessary to avoid unnecessarily increasing the thickness of the base metal or the volume of the weld to produce multidirectional stresses.
Welding heat source characteristics, power density, line energy and other process parameters will directly determine the temperature field and thermal cycle of the joint, which will have a significant impact on the size of the weld and heat affected zone, tissue changes, defect sensitivity and so on. For example, preheating before welding and slow cooling after welding can reduce the cooling rate of the joint, which can reduce the hardening tendency and cold crack sensitivity of the joint. Choosing a reasonable welding sequence can improve the constraint degree and profitability of the structure. Using argon arc welding and other welding methods, the welding area can be closely protected, reduce the burning loss of alloy elements, and obtain satisfactory joint performance.
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