卧式卷纬机的零件揿手(见附图)是停车的主要零件,使用中头部磨损较大,需要淬火。此零件由2mm厚A3钢板落料成型(件2),头部焊接一块2mm厚45钢板制成的头子(件1),然后淬火、回火、发黑。淬火时,利用小孔串挂在专用挂具上在盐浴炉局部加热淬火,再清除残盐,这样既耗能又费时,费用也较高。我们发现在两件点焊结合时,头部焊接部位温度普遍达到820℃左右,而且比较均匀。根据45钢的相变温度 Part of the horizontal weft knitting machine (see photo) is the main part of the parking, the use of large head wear, the need to quench. This part consists of a 2mm thick A3 sheet blanked (part 2) and a head made of 2mm thick 45 steel (Item 1) welded to the head, then quenched, tempered and blackened. Quenching, the use of small holes hanging on the special hanging in the local salt bath furnace heating quenching, and then remove residual salt, so that both energy-consuming and time-consuming, the cost is higher. We found that when the two pieces of spot welding are combined, the temperature of the welding portion of the head generally reaches about 820 ° C, and is more uniform. According to 45 steel phase transition temperature