1. Warm up
Before welding the Alloy seamless pipe, the Alloy seamless pipe is mainly heated, and the temperature is controlled for 30 minutes before the welding starts.
The heating and virtual beam temperature tempering of electric welding are actively operated by the temperature control cabinet of the temperature adjustment treatment. Adopt far-infrared tracking heat treatment furnace plate. Fully intelligent and active setting of the graph and record the graph, the thermal resistance accurately measures the temperature. The thermal resistance measuring point is 15mm-20mm away from the edge of the weld when heating.

2. Welding method
1. In order to prevent welding deformation of the Alloy seamless pipe, each column joint is welded symmetrically by two people, and the welding direction is from the middle to the two sides. The welding inside is open (when the inside is open, the weld is close to the beam), the actual operation is from the layer of Alloy seamless pipe, the third layer of Alloy seamless pipe must be small in size, because the electric welding endangers the main reason for welding deformation. After welding one to three layers, reverse planing should be carried out. After the application of carbon arc gouging, the welding machinery and equipment need to be polished, and the welding surface is nitrided and combed to show the metal texture and prevent the surface carbonization from causing cracks. The outer hole is welded once, and the remaining inner holes are welded once.
2. When electric welding = two layers of Alloy seamless pipe, the welding direction should be opposite to that of the first layer of Alloy seamless pipe, and so on. The butt welds of each layer are separated by 15-20mm.
3. The welding current, welding speed and number of overlapping layers of multiple welding machines should be maintained.
4. In electric welding, you must start welding from the pilot arc board and finish welding on the pilot arc board. Cut, polish and clean after welding.
3. After quenching and tempering
After the welding seam is welded, it should be tempered within 12 hours. If the Alloy seamless pipe cannot be quenched and tempered immediately, the suggestions for heat preservation and slow cooling should be followed. When tempering, the temperature of the two thermal resistances should be measured, and the thermal resistances should be welded on both sides of the weld.