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1·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.

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。

2·A particular device of location and compaction for welding by one side in shape by both sides was designed according to the enterprises requirement in steel plates butt joint.

针对某企业需求的平板对接，为解决大型钢板焊接不易翻转的难题，设计了一种单面焊双面成形定位压紧小车。