Welding voltage parameter control of stainless steel exhaust manifold

The welding voltage determines the length and energy density of the welding arc, which in turn affects the weld penetration, weld width and welding speed. In the welding process of stainless steel exhaust manifold, appropriate welding voltage can ensure the full fusion of the weld, avoid defects such as unfusion and slag inclusion, and ensure the strength and sealing of the weld.
Matching principle: The welding voltage should match the welding current to ensure the stability of the welding arc and the forming quality of the weld. Generally speaking, when the welding current increases, the welding voltage should also be increased accordingly to maintain the stable burning of the arc.
Material adaptability: Stainless steel has a low thermal conductivity and is prone to generate large thermal stress during welding. Therefore, when selecting the welding voltage, the thermophysical properties of stainless steel should be considered to avoid excessive welding voltage causing overheating and burn-through of the weld.
Process requirements: Different welding processes have different requirements for welding voltage. For example, TIG welding requires a lower welding voltage and a higher welding current to obtain a narrow and deep weld; while MIG welding may require a higher welding voltage and a moderate welding current to obtain a wide and shallow weld.
Control method of welding voltage
Preset parameter method: preset the value of welding voltage according to the type, thickness and welding process requirements of welding materials. In the actual welding process, the welding voltage is set within the preset value range by adjusting the control panel of the welding machine.
Real-time monitoring method: using the current, voltage and other signals in the welding process, the change of welding voltage is monitored in real time through sensors. When the welding voltage deviates from the preset value, the output voltage of the welding machine is automatically adjusted to keep the welding voltage stable.
Experience adjustment method: for experienced welders, the welding voltage can be manually adjusted by observing the forming quality of the weld, the shape and color of the molten pool, etc. This method requires welders to have rich practical experience and keen observation.