Which filler weld repair method is better for graphite copper bushings after wear?

Argon arc welding repair method

Principle:

Argon arc welding is an arc welding method that uses argon gas as a protective gas. When repairing graphite copper bushings, argon gas can effectively isolate the air and prevent the copper from being oxidized during the high temperature welding process. At the same time, by adjusting the welding current and wire feeding speed, the size and shape of the welding molten pool can be precisely controlled, so that the filler metal and the graphite copper bushings matrix are well integrated.

Advantages:

High weld quality: argon arc welding produces dense, uniform welds with fewer defects such as porosity and slag entrapment. This is because the protective effect of argon gas can reduce the welding process of impurities mixed in, thus ensuring the quality of the weld. For graphite copper bushings such as high requirements for dimensional accuracy and surface quality of the components, high-quality welds can better restore its original shape and performance.

Small heat-affected zone: Due to the concentrated energy of argon arc welding, the welding process has less thermal impact on the material around the graphite copper sleeve. This means that after the welding is completed, the degree of deformation of the copper bushing is lower, reducing the amount of subsequent processing and calibration. For example, for graphite bronze bushings in some high-precision equipment, a small heat-affected zone can effectively avoid fit-up accuracy problems caused by welding thermal deformation.

Gas welding repair method

Principle:

Gas welding is the use of combustible gas mixed with oxygen combustion produced by the flame to heat and melt the metal welding method. When repairing graphite copper bushings, by adjusting the size and nature of the flame (e.g. neutral flame, oxidizing flame or carbonizing flame), the filler metal (e.g. copper wire) will be melted and filled into the wear parts.

Advantages:

Simple equipment: gas welding equipment is relatively simple and low-cost, which makes it easy to use in some cases where field maintenance conditions are limited. For example, in some small factories or field work sites, gas welding equipment is easy to carry and operate, and can quickly make initial repairs to graphite copper bushings.

High flexibility: the position and direction of the flame can be adjusted to conveniently weld wear parts of different shapes and positions. For some irregularly shaped wear areas on the graphite copper bushing, gas welding can be better adapted to the welding requirements.

Laser welding repair method

Principle:

Laser welding is a welding method that utilizes a high energy density laser beam as a heat source. The laser beam is focused on the wear area of the graphite copper bushing, so that the material instantly melts and solidifies, realizing the welding repair.

Advantages:

High-precision repair: Laser welding is capable of very precise welding with a narrow weld width and a very small heat-affected zone. This is very favorable for the repair of graphite copper bushings with very high dimensional accuracy requirements, and can minimize the impact on the original size and shape of the bushings. For example, for some precision instruments in the graphite copper bushing, laser welding can accurately fill the wear parts, so that it is restored to near-original precision.

Fast welding speed: Laser welding is much faster than traditional welding methods and can complete the repair work in a short time. This is very helpful in situations where equipment operation needs to be restored quickly.