The arc breaking burn through defects may generate in inside and outside unit of SAWL pipe production line, the main causes are welding carriage crawling, pre-welding and repair welding shallow for weld etc. In this article, it analyzed the reason of crawling, and adopted according improvement measures, that is conducting transform for welding carriage tracks, transverse carriage tracks, welding carriage body and reducer of transverse carriage. The modified actual use results showed that transportation system transform of welding carriage not only reduced probability of arc breaking burn through, but also decreased appear probability of undercut, slag inclusion etc., as well as welding speed more stable.%直缝埋弧焊管生产线内外焊机组在焊接过程中会产生断弧烧穿缺陷，其主要原因为焊接车卡阻爬行和预焊及预焊修补焊缝浅等。分析了焊接车卡阻爬行的原因，并采取了相应的改进措施，即分别对焊接车道轨与横移车道轨、焊接车车体以及横移车减速机等进行了改造。改造后的实际使用结果表明，此次对焊接车输送系统的改造不仅直接降低了断弧烧穿缺陷的产生概率，而且使焊速更为稳定，也减少了咬边、夹渣等缺陷的出现几率。
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