What is the effect of welding process on welding effect?
Release time:
2022-12-05
【Summary Description】 Process factors. Process factors include welding methods used in construction, welding process specifications (such as welding heat input, preheating, welding sequence, etc.), post-weld heat treatment, etc. In the same base metal, using different welding methods and process measures, the weldability is very different. For example, aluminum and its alloys are difficult to be welded by gas welding, but good welding results can be obtained by argon arc welding. Titanium alloy for hydrogen, oxygen, N. gas welding and electrode arc welding can not be good welding, and argon arc welding or electron beam welding is easier to weld. Therefore, the development of new welding methods and new processes is an important way to improve the weldability of the process. The effect of welding method on weldability is first manifested in the energy density, temperature and heat input of the welding heat source. Secondly, it is manifested in the way to protect the molten pool and the vicinity of the joint, such as protective slag, gas protection, slag-gas joint protection, vacuum welding, etc. For high-strength steel having an overheating sensitivity, narrow-gap gas shielded welding, pulsed arc welding, plasma arc welding, or the like can be used from the viewpoint of preventing overheating. Can be used to improve its weldability. The most commonly used process measures are preheating before welding, slow cooling and post-weld heat treatment. These process measures are effective measures to prevent hardening and embrittlement of heat-affected zone, reduce welding stress and avoid hydrogen-induced cracks. Reasonable arrangement of welding sequence can also reduce stress and deformation. In principle, the workpiece to be welded should be in a state of free expansion and contraction as much as possible during the entire welding process. Post weld heat treatment can eliminate residual stress, prevent delayed cracking, and allow hydrogen to escape. In addition, the gas cutting, cold working, assembly and other processes of metal materials before welding should conform to the characteristics of the material to avoid defects such as welding cracks due to local hardening, embrittlement and stress concentration.
Process factors.
Process factors include welding methods used in construction, welding process specifications (such as welding heat input, preheating, welding sequence, etc.), post-weld heat treatment, etc.
In the same base metal, using different welding methods and process measures, the weldability is very different. For example, aluminum and its alloys are difficult to be welded by gas welding, but good welding results can be obtained by argon arc welding. Titanium alloy for hydrogen, oxygen, N. gas welding and electrode arc welding can not be good welding, and argon arc welding or electron beam welding is easier to weld. Therefore, the development of new welding methods and new processes is an important way to improve the weldability of the process.
The effect of welding method on weldability is first manifested in the energy density, temperature and heat input of the welding heat source. Secondly, it is manifested in the way to protect the molten pool and the vicinity of the joint, such as protective slag, gas protection, slag-gas joint protection, vacuum welding, etc. For high-strength steel having an overheating sensitivity, narrow-gap gas shielded welding, pulsed arc welding, plasma arc welding, or the like can be used from the viewpoint of preventing overheating. Can be used to improve its weldability.
The most commonly used process measures are preheating before welding, slow cooling and post-weld heat treatment. These process measures are effective measures to prevent hardening and embrittlement of heat-affected zone, reduce welding stress and avoid hydrogen-induced cracks. Reasonable arrangement of welding sequence can also reduce stress and deformation. In principle, the workpiece to be welded should be in a state of free expansion and contraction as much as possible during the entire welding process. Post weld heat treatment can eliminate residual stress, prevent delayed cracking, and allow hydrogen to escape. In addition, the gas cutting, cold working, assembly and other processes of metal materials before welding should conform to the characteristics of the material to avoid defects such as welding cracks due to local hardening, embrittlement and stress concentration.
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