埋弧自动焊接法自五十年代推广应用以来,在提高焊接速度和质量方面发挥了很大作用。由于生产发展的需要,人们在埋弧焊接的基础上,又研制了许多效率更高的焊接方法,有的已在生产中获得应用。现将几种便于实施的高效率埋弧自动焊接法介绍如下。一、预热焊丝法一般埋弧焊接时,焊丝的伸出长度为30～60毫米。所谓预热焊丝法就是把焊丝伸出长度增大至190毫米以上,借流经焊丝的电流产生电阻热,从 Submerged arc welding since the promotion and application of the fifties, in improving the welding speed and quality has played a significant role. Due to the needs of the development of production, people in the submerged arc welding based on the development of a number of more efficient welding methods, and some have been applied in production. Now several easy to implement high efficiency submerged arc welding method is described below. First, preheat wire method Submerged arc welding, the wire length of 30 to 60 mm. The so-called preheated wire method is to extend the wire length to 190 mm or more, by flowing through the wire current resistance heat, from