(2) Sub-segment partial de-soldering method. This method is suitable for the welding of medium or thin steel plates. Its advantage is that the heat dissipation in the middle is fast, and the temperature difference between the two ends of the weld is reduced. The temperature in the heat affected zone of the weld does not increase sharply, reducing or avoiding thermal expansion deformation. This method is especially suitable for flat welding and overhead welding. Horizontal welding is generally not used, and vertical welding cannot be used at all.
(3) Jump welding method. In addition to vertical welding, this method is applicable to three methods: flat welding, horizontal welding and overhead welding. It is used in the long weld of 6-12mm thick steel plate and the welding of cast iron, stainless steel and copper to disperse the weld heat and avoid or reduce the deformation. The length of each weld of steel should be between 200-4O0mm; the weldment of cast iron should be treated according to the specification of cast iron; the heat transfer of stainless steel and steel should be faster than the length of each section should be shorter than 200mm.)
(4) Alternate welding method. This welding method is basically the same as the jump welding method, except that each welding distance is elongated, which is especially suitable for thin plates and long welds.