根据不均匀的焊接温度场和施焊时焊接构件的刚性条件，可以认为焊接残余变形和残余应力是不可避免的。
According to the asymmetry welding temperature fields and the rigidity of component when welding, we could think it is inevitable that welding would bring remains-strain and remains-stress.
冷弯焊管设备是生产焊管、开口及闭口冷弯型钢必不可少的设备之一。
Cold bend welding pipe equipment is indispensable to welding pipe production and cold bend type steel with open or close entrance.
在打螺栓孔的时候是不可以把螺栓孔打在有大型法兰焊口的地方的。
When a bolt is not to play in a large flange bolt hole welding place.
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