Single-contact spot-welding gun and application thereof

Abstract

The invention discloses a single-contact spot-welding gun and application of the single-contact spot-welding gun. The single-contact spot-welding gun is characterized in that a main electrode and a secondary electrode are arranged at the bottom of a mounting base in parallel through a welding gun frame; an electrode cap is arranged at the front end of the main electrode; the main electrode is driven by a pneumatic servo air cylinder to move in the axis direction; a flexible copper strip is arranged at the front end of the secondary electrode; the secondary electrode is driven by an auxiliary air cylinder to move in the axis direction; the main electrode is connected with a welding transformer through a main electrode copper strip; the secondary electrode is connected with the welding transformer through a secondary electrode copper strip. Single-face traceless spot welding is achieved, welding can be carried out on an appearance coverage part, an inner plate and an outer plate have certain welding strength, and it can be ensured that the appearance face quality is not affected.

Description

technical field [0001] The invention relates to a single-side contact spot welding torch, more specifically a single-side contact spot welding torch used in the field of automobile body-in-white welding. Background technique [0002] Welding is the most widely used assembly connection method in the automotive industry. Spot welding has become the main connection method for automobile body-in-white assembly due to its advantages of reliable technology, low cost, high efficiency and simple method. A typical car body-in-white is welded by 300-500 sheet metal stamping parts, with as many as 3000-5000 welding points. Therefore, the quality of solder joints largely determines the strength of the vehicle body and directly affects the safety and service life of the vehicle. [0003] Double-sided resistance spot welding is the most widely used in automobile body-in-white welding. It pressurizes both sides of the plate, energizes to generate thermal coupling, and forms a nugget of so...

AI Technical Summary

Problems solved by technology

However, double-sided resistance spot welding will produce traces of solder joints on both sides of the board, which cannot be applied to appearance coverings with appearance quality requirements, such as four doors and two covers. method to ensure connection strength

[0004] After the hemming of the four doors and two covers in the body shop is completed, it needs to be sent to the painting workshop for curing of the hemming glue. However, due to reasons such as handling, vibration, assembly, electrophoresis, etc., the inner and outer panels will move in series and the parts will be deformed, which will affect the subsequent process. have an impact

The commonly used post-hemming process is to use gel curing or CO 2 Shielded welding is used as a temporary fixing process, but there are some defects and limitations

The gel curing process is easy to cause surface defects and size fluctuations, low flexibility, high cost, and serious environmental pollution; while CO 2 Shielded welding is easy to cause damage to the appearance quality, and will produce toxic gas, and the formed solder joints need to be manually polished

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