Adopting Appropriate Welding Sequences (for Multi - pass Welding or Large Welded Components): For welded components with multiple weld passes, reasonable welding sequences should be adopted, such as symmetrical welding or backstep welding. Symmetrical welding means welding on both sides of the welded component simultaneously, so that the heat distribution on both sides is relatively uniform, reducing welding deformation and stress concentration. Backstep welding divides the weld into several segments, starts welding from one end, and then welds each segment in the opposite direction one by one. This method can avoid excessive heat accumulation at one end of the weld and make the heat distribution more uniform along the entire length of the weld. For large welded components, the zoning welding method can also be adopted. Divide the welded component into multiple regions and weld each region in a certain order one by one to prevent heat from concentrating in a certain local area.

 

 

 

Aspects of Welding Parameter Settings

Optimizing Welding Current and Voltage Parameters: Precisely adjust the welding current and voltage according to factors such as the material and thickness of the welded part. During the welding process, avoid frequently and significantly adjusting the current and voltage. For example, when welding steel plates with a thickness of 4 - 6mm, once suitable current (such as 160 - 200A) and voltage (such as 22 - 26V) parameters are determined, they should be kept as stable as possible. Because changes in current and voltage will directly lead to changes in arc power and thus affect heat input.

Controlling Heat Input (through the Combined Effect of Adjusting Welding Speed, Current, and Voltage): The heat input can be reasonably controlled by calculating the heat input formula (heat input = (welding current × welding voltage) / welding speed). For example, on the premise of ensuring weld quality, when it is necessary to reduce heat input, the welding speed can be appropriately increased, or the welding current and voltage can be reduced; when it is necessary to increase heat input, the opposite operations can be carried out. And during the entire welding process, a reasonable combination of these parameters should be maintained to make the heat input relatively uniform at all parts of the weld.

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