1, according to the diameter of reel making school circle model, the arc length of the pipe circumference of 1/6 ~ 1/4, do not fit the gap to meet the requirements.
2. The quality of the groove shall be checked when the pipe and pipe fittings are in alignment. And cleaning the inside and outside sides of the groove. There is rust and can be polished by sanding machine.
3, check the material and specifications are in line with the design requirements, materials and certificates are complete, there are cracks, shrinkage, wrinkling, delamination and other defects, should be refused to use.
4, welding rod requirements: welding carbon steel welding rod using E4303 welding rod, welding 16Mn steel plate welding electrode, using E5016 welding rod. When 16Mn steel and carbon steel joint, E4316 welding rod. Before welding the electrode, it should be dried according to the instruction manual and kept dry in use. The electrode coating should be free of cracks and obvious cracks.
6, the first pressure head treatment, and then roll system.
7, the formal construction of welding materials, welding process is the same.
8. When the wall thickness is different, the difference between the wall thickness of the two pipe shall not exceed 15% of the thickness of the pipe wall and shall not exceed 3mm.
9, different diameter of the pipe butt welding, can be welded to the end of the big pipe processing into big head, also can use steel plate making big head.
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