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Main factors affecting weldability
1. Material factors; Materials refer to the metal materials used to manufacture structures and the materials consumed by welding. The former is called base metal or base metal, that is, the metal to be welded; The latter is called welding material, including welding wire, flux, shielding gas, etc. The chemical composition (including the distribution and content of impurities) is the main influencing factor. In welded structures, the vast majority of commonly used metal materials are steel. Carbon has a great influence on the weldability of steel. The higher the carbon content, the worse the weldability.
2. Design factors; Design factor refers to that the use of welded structure is not only affected by materials, but also affected by structural form to a great extent.
3. Process factors: process factors include welding methods (such as arc welding, submerged arc welding, gas shielded welding, etc.), welding process (including welding specification parameters, welding materials, preheating, assembly and welding sequence), post weld heat treatment, etc.
4. Use factors: use factors refer to the working temperature, load conditions and working environment of the welded structure (chemical area, coastal and corrosive medium, etc.). Generally speaking, the lower the ambient temperature is, the more vulnerable the steel structure is to brittle failure.
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