Welding is a very important step in the production of electric heater system. Most of the system is transported by pipelines, so the connection between pipes and pipes, pipes and other components is welded except for bolted connections. First, the flange is welded to the pipe, and then the two pipes are connected by the bolt connection. Because of the hot oil in the pipe, the temperature and pressure are high, and the quality of the whole system is directly affected by the quality of the welding. It can be seen from this that the welding process is an indispensable step in the design of the heat conduction oil and electric heater system.
Welding is a process of local rapid heating and cooling. It is restricted by the body around the workpiece and can not expand and shrink freely. After welding, the workpiece will generate welding stress or even deformation in the weldment.
Therefore, some important products should eliminate the welding stress in the welding parts and correct the welding deformation after welding. Today's welding technology has been a great development, the mechanical properties of welding can be equal to or even higher than the welded joint, without internal and external defects. The welded joint is the location of the welding body in the space. The strength of the joint is affected not only by the quality of the weld, but also by the geometry, the force, the size and the working conditions.
The basic forms of the joint are butt, lap, T-joint (direct connection) and angle connection.
In modern metal processing, compared with the casting and forging technology, welding technology is the latest development, but the speed of development is the fastest. The weight of the welding structure is about 45% of the output of steel. In the production of aluminum and aluminum alloy, the proportion of welding structure is also increasing.
In the future development of welding technology, one side should develop new welding methods, welding materials and welding equipment to further improve safety, reliability and welding quality. For example, to improve the existing welding energy such as arc, laser, electron beam and plasma arc, develop a lightweight and reliable arc tracking method by using control technology and electronic technology, and improving the performance of arc technology. On the other hand, improve the welding mechanization and automation level, such as the implementation of welding procedure control, digital control; developed from the preparation process of a special welding welding quality control of all process automation; automation in production line, to promote and expand NC welding robot welding, so that to improve the level of production by this manipulator can be 24 hours of continuous work, welding the female health conditions can be greatly improved.