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随着汽车环保与安全要求的提高,汽车车身板件越来越薄,但安全性能却越来越好,普通钢材已不能适用于现代汽车车身制造的需要。为此,当代汽车车身采用了大量高强度和超高强度钢板,这些材料的大量使用使车身板件的性能发生了很大的变化。在进行车身维修需要更换板件时,传统的氧-乙炔焊,由于其温度高,热影响范围大,极易引起板件变形和强度下降,已不能适应当代汽车车身焊接的要求。隋性气体保护焊焊接速度快,操作灵活方便,可全位置焊接,特别是焊接薄板时热输入低,可避免薄板变形及扭曲。目前车身焊接一般用CO_2或CO_2和Ar的混合气
With the improvement of automobile environmental protection and safety requirements, the automobile body panels are getting thinner and thinner, but the safety performance is getting better and better. Ordinary steel can no longer be applied to the needs of modern automobile body manufacture. For this reason, contemporary automobile bodies employ a large amount of high-strength and ultra-high-strength steel plates, and the extensive use of these materials causes a great change in the performance of body panels. Traditional oxy-acetylene welding, due to its high temperature and large heat-affected range, can easily cause the plate to deform and reduce its strength when it is needed to replace the plate for vehicle body repair. Therefore, the conventional oxy-acetylene welding can no longer meet the requirements of contemporary automobile body welding. Inert Gas Welding Welding speed, flexible and convenient operation, all-position welding, especially when welding heat input low sheet, sheet deformation and distortion can be avoided. The current body welding generally CO 2 or CO 2 and Ar mixture