直缝埋弧焊钢管

双面是在1940年发明的一种新的焊接方法，它和前面的手工焊相同的地方是它还是采用渣保护，但是这个渣不是焊条的药皮，是专门熔炼出来的焊药。这个焊药系统由一个漏斗装的焊药通过一个管道输送到要焊接的前面。第二个不同是不采用焊条，采用焊丝，因为焊丝可以连续送给

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