helically-welded case 螺旋焊接壳体 ; 螺旋烧焊壳体
welded spiral case 钢板焊接蜗壳
welded steel cartridge case 焊接钢质药筒
In this case, welded joint with smaller volume are more favorable.
在这情况，用比较小的体积焊接关节是更有利的。
In the case of welded tube and pipe, test heads can be provided for manual or automated weld following.
碰到焊接管材时，这些探头可手动焊接或者自动焊接。
Requirements for site welded circumferential seams shall be agreed on a case by case basis prior to order.
现场环缝焊接要求在签订订单之前，具体要求具体的商定。看看怎么样？
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