法兰允许用钢板拼接焊制，对长颈法兰应符合GB 150的有关规定。
Blend steel welding of flanges is allowed. Long neck flange should conform to related stipulations of GB 150.
本龙门焊机是为焊制几十米长的大型箱式结构件而研制的弧焊设备。
This gantry type welding machine is an arc welding equipment developed for welding large box type construction of tens meters long.
介绍了螺旋焊管机组成型辊的工作状况和在制管成型中的作用。
The article introduces the working conditions of forming rollers for SSAW pipe unit and its function for pipe forming.
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