Welding is a very important part in the production of electric heater system. Most of the system is carried by the pipeline, so the connection between the pipe and the pipe, the pipe and other parts, in addition to the bolt connection is the use of welding method. First the flange welded to the pipe, and then through the bolts to connect the two pipes. Because the pipeline is sweet hot oil, so the temperature and pressure are very high, the welding quality will directly affects the quality of the whole system.

Welding is a process of rapid heating and cooling, the body is not free expansion and contraction of the welding area, parts cooling will produce welding in the welding stress and deformation.

Some important products in the welding process to eliminate the welding stress, welding distortion. The welding technology has developed greatly, and the mechanical properties of the welding machine can be welded, even higher than that of the connecting body and the weld with no internal and external defects.

In the future development of welding technology, on the one hand to develop a new welding method, welding material and welding equipment, to further improve the safety and reliability of welding. For example, the improvement of the existing arc, laser, plasma arc welding energy; the use of control technology and electronic technology, the improvement of the arc process performance, developed a lightweight and reliable arc tracking method. On the other hand, improve the welding mechanization and automation level, such as welding procedure control, digital control; develop a special welding machine which can improve the welding production level from the welding to the quality control.