Welding fixture is used to ensure the size of weldment, improve assembly accuracy and efficiency, and prevent welding deformation. There are many kinds, most of which are used for specific occasions (products). For example, the position of the axle in the bicycle frame shown below is welded by five pipes. Without a special welding fixture, it is difficult to ensure the correct position of each other.

The picture below shows a universal welding fixture, which can ensure the right angle between weldments.

General requirements of welding fixture:

Quick action and convenient operation;

There is enough assembly and welding space, which will not affect the welding operation and observation, and will not hinder the loading and unloading of weldments;

Reliable clamping and proper rigidity. Can't destroy the positioning position and geometry of the weldment;

If necessary, protective devices should be set up;

Will not be damaged in the welding process;

The application point of the fixture should be located at or near the support of the weldment to prevent the supporting reaction force from forming a couple with the clamping force or gravity;

Pay attention to the special requirements of various welding methods for fixtures in terms of heat conduction, electricity conduction, magnetic isolation and insulation;

The positioner and clamping mechanism on the fixture should not have too many mechanical forms to facilitate manufacturing and maintenance;

Pneumatic and other driving modes can be adopted to improve production efficiency and reduce labor intensity of workers;

Give priority to the use of universal and standardized clamping mechanisms and standard parts; ?

As a part of the secondary circuit of welding power supply, a secondary circuit should be led out from the nearest end of the weldment to avoid welding current passing through the whole fixture;

Wearable parts are usually designed as replaceable structures;

Easy to manufacture, less investment, low manufacturing cost and short payback period. When in use, the energy consumption and management cost are low.