一、焊接方法及其特点加铁粉单面埋弧自动焊接法如图1所示,其主要特点是在焊接接头的背面衬以有槽的紫铜衬垫,并于坡口中加入一定数量的铁粉或合金粉末,然后用普通埋弧自动焊机从一面施行焊接,从而实现单面焊接、两面同时成型。这是一种工艺简单、操作方便、效率高的埋弧焊接法。这种方法另一个重要特点是:焊接过程中,靠近电弧前方的铁粉,因受电弧热的作用先行熔化,在铜垫的凹槽内形成一个熔融的液态金属层,电弧在这一液态层上燃烧。这样,就改善了焊缝根部间隙的敏感性,使背面焊道成型相当均匀平齐;同时电弧在液态层上燃烧也保护铜垫免受电弧的直接作用,因此可以 First, the welding method and its characteristics Add single-sided iron submerged arc welding method shown in Figure 1, its main feature is the back of the welded joints lined with grooved copper liner, and in the bevel by adding a certain amount of iron Powder or alloy powder, and then use common submerged arc welding machine from one side of the implementation of welding, so as to achieve single-sided welding, both sides at the same time molding. This is a simple process, easy operation, high efficiency submerged arc welding. Another important feature of this method is that during the welding process, the iron powder near the front of the arc is melted by the action of electric arc heat to form a molten liquid metal layer in the groove of the copper pad. The arc in the liquid layer Burning on. In this way, the sensitivity of the weld root clearance is improved and the back weld bead is formed fairly evenly flush; at the same time the arc burning on the liquid layer also protects the copper pad from the direct effect of the arc and therefore