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How to weld pipe welds:
1. select welding process parameters.
Welding process parameters are an important basis for guiding welding operations. From root welding to filling and capping welding, the welding process specification shall be observed and the welding process parameters shall be strictly controlled.
2. root welding.
Preheating before welding: X70 steel has high grade and strong crack tendency. Preheat before root welding and heat the groove and surrounding to 80~120 ℃.
Root welding: E6010 cellulose shall be used for downward welding, and the combination of two persons shall be welded from the top of the pipe. The starting point shall be welded from 5mm~8mm from the top to the center line, and the arc shall be struck from the groove surface to the groove root. After the blunt edge is melted, it shall be directly dragged down along the welding.
Short arc operation is adopted to prevent air holes, which is conducive to the melting of groove root, to prevent non welding and non melting, to prevent concave and collapse, and to enrich the joints when replacing welding rods.
After root welding, remove the slag and splash on the surface. In particular, the boundary of the welding and groove surface shall be cleaned to avoid slag during the welding of the lower layer.
3. filling welding:
Filling layer selection Lincoln e81t8-g φ 2.0 flux cored self shielded welding wire, manual and semi-automatic welding.
Grade X70 steel has certain cracking tendency. In order to prevent cracking and ensure that the interlayer temperature reaches above 80 ℃, appropriate heating measures shall be taken for welding construction in winter. After the root welding, the welding layer shall be cleaned immediately, and then the welding of the thermal welding layer and the filler layer shall be carried out. The welding defects of the filler layer are mainly air holes, slag and unmelted. During filling welding, keep short arc welding, and adjust the inclination of the welding gun from top to bottom with a straight transport strip or a slight swing
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