Fixed type projection welder and multi-section projection welding method

Abstract

The invention discloses a fixed type projection welder. The fixed type projection welder comprises a lower electrode base. The lower electrode base comprises an electrode head base and an electrode base body. The electrode head base is arranged on the top of the electrode base body. An included angle is formed by the upper surface of the electrode head base and the horizontal direction. An electrode head is arranged on the electrode head base. The electrode base body comprises a cooling water inlet and a cooling water outlet, and the inlet and the outlet are respectively formed in the surface of the electrode base body. The electrode base body is internally provided with a cooling water channel connected with the electrode head, the cooling water inlet and the cooling water outlet. A multi-section projection welding method comprises the following steps that firstly, an inversion medium-frequency direct current welding device is utilized, secondly, a small assembly component is welded with two points through a cantilever type spot welding machine via a maturely designed welding clamp, and thirdly, the fixed type projection welder is utilized for welding the rest of welding spots in a strengthened mode. According to the fixed type projection welder and the multi-section projection welding method, the requirement for the performance for welding a high-strength steel plate can be met, a traditional spot welding technology is replaced, and the requirements for size precision, welding and product size are met.

Description

technical field [0001] The present invention relates to a component assembly resistance welding device and method, more specifically, to a fixed projection welding machine and a multi-stage projection welding method. Background technique [0002] At present, the common spot welding process is operated by cantilever spot welding machine equipment. The welding process is mature and can be completed through the cooperation of well-designed welding fixture tooling and welding tong angle. However, relying on such a welding method cannot meet the welding performance requirements and assembly size requirements of the high-strength assembly parts. [0003] In a welding cycle of the traditional bump welding process, the welding current is mainly concentrated in the middle section, and there is no need for preheating and postheating two parts of current for supplementary welding. Ordinary upper and lower electrode seats are cylindrical chrome-zirconium copper rods, and the upper and ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fixed projection welding machine and a multi-stage projection welding method to solve the problems in the prior art that the size of the solder joints is too small and the quality of the solder joints is difficult to guarantee

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