Understanding these welding material selection principles is too helpful for welders.
Release time:
2022-04-07
【Summary Description】 If the base metal carbon or sulfur, phosphorus and other harmful impurities are high, you need to consider the choice of Welding processing materials with strong crack resistance.
From the analysis of physical, mechanical properties and chemical composition, we should pay attention to the selection method of weldments in these aspects. Generally, for structural steel welding workpieces, we should first consider whether the strength meets the mechanical properties requirements of the joint. For dissimilar steel welded joints between low carbon steel and low alloy steel, welding materials with lower strength grade can be selected. For the welding of heat-resistant steel and stainless steel, in addition to the principle of strength, it is also necessary to consider the chemical composition of the weld and the base metal. If you encounter a higher level of harmful impurities such as carbon or sulfur or phosphorus in the base material, you need to consider choosing a more resistant to cracking.Welding processingMaterials.
FromWelding equipmentThe working conditions and performance analysis, we encounter the requirements to ensure tensile strength, yield strength, impact toughness, plasticity have higher requirements, you can choose the low hydrogen type.Welding materials. When encountering high performance requirements for corrosion, you can choose a suitable stainless steel Welding materials. In addition, there are Welding materials that have good wear resistance or can ensure low or high temperature mechanical properties.
From the complexity and structural characteristics, welded joint type, complex shape or large thickness of the weldment, more prone to cracking, so the crack resistance of good welding material is more suitable, such as low hydrogen type electrode, high toughness electrode. If it is limited by the part of the workpiece, it is difficult to clean, it should be used not easy to rust, oxide skin and oil reaction is not sensitive to the welding material, acid electrode is a good choice.
In addition, it is also necessary to select welding materials with different applicability according to the spatial position of the weld, working conditions, operating environment, etc. The welding economy and the efficiency of welding equipment are also very important, especially for enterprises with large processing capacity. High-efficiency welding materials are more suitable.
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