Play a major role in the automatic submerged arc welding, welding parameters on the welding quality, and welders manipulation technology only a secondary position, buried lone automatic welding welding parameters welding current, arc voltage, welding speed, wire diameter and wire extension length, etc. However, these norms parameter m reflects the weld shape coefficient and fusion welding quality film noon. In addition, the types of welding power source and connected in the groove and assembly flooded, welding layers of workpiece preheating temperature, etc. also belong to the welding specifications. Lap spot welding 
 Weld melt width and melt depth is called the weld shape factor, the letter ψ, namely ψ = B / H.ψ large that the weld width and shallow. ψ is small said welds narrow narrow and deep. Under normal circumstances, ψ should be controlled at between 1.3 - 2, then weld a wide and shallow. Dissolved gas in the pool and impurities floating to prevent stomatal folder. Slag and hot cracks are more favorable. If ψ choose too small. Easily produced angry hole, slag and hot crack trap. Lap spot welding 
 The ratio of the cross-sectional area of ??the weld metal cross-sectional area of ??the weld in the base metal melting. Known as the fusion of the weld metal than r to. Ie r = fm (Fm-Fn). Fusion ratio r weld chemical composition, microstructure and mechanical function. the size of the fusion ratio. said that the proportion of the base metal in the weld wire and base metal chemical composition differences. usually wire low carbon content lower, sulfur, phosphorus and other harmful elements. being stronger than when the weld fusion time, the chemical composition of the microstructure and welded joints mechanical function will have a greater difference. " Therefore, by adjusting the welding parameters to change the fusion ratio, often become an important way for progress in the quality of welding fusion ratio varies, can be in the] 10 percent, a 85% change. Actual welding details and requirements of its appropriate control. General automatic welding, r = 60% -70%. Lap spot welding