采用焊道错位叠加方法，再现了螺旋管双面埋弧焊制管过程中内、外焊焊接热影响区(HAZ)的焊接热循环。

In this paper the HAZ weld thermal cycles of the welding by both sides submerged arc welded steel pipe were reproduced by the dislocation overlap weld method.

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节点中的焊接宜采用完全焊透的坡口对接焊缝连接，当采用双面角焊缝连接时，可按等强设计。

And the welding connecting of them are advised to use slope butt weld that are fully welded, but when the double-sided fillet weld is used, they should be design on equal strength.

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研究结果表明，连续激光氦气双面保护可以获得保护效果可靠、无缺陷、成型良好的焊接接头。

The results indicate that defect free joints with excellent appearance could be acquired by continuous laser welding with flowing helium from top and back sides.

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