Welding repairing method for tin-based bearing alloy bearing bush

Abstract

The invention relates to a welding repairing method for a tin-based bearing alloy bearing bush. The welding repairing method comprises the following steps that (1) a welding wire is prepared, specifically, a babbitt material matched with the tin-based bearing alloy bearing bush is selected to be smelted, and the welding wire is prepared; (2) the surface of the tin-based bearing alloy bearing bush is processed; and (3) TIG direct current welding is adopted, argon inert gas protecting is conducted, flat welding is adopted, wire filling welding repairing is conducted through a leftward welding method, the surface of the last layer of welding bead is higher than the original surface of the bearing bush, then protecting nozzle repairing welding is adopted, and the repaired bearing bush is obtained through machining. According to the welding repairing method for the tin-based bearing alloy bearing bush, operation is easy; the repairing result is ideal; the qualified rate is high; the reuse rate of the tin-based bearing alloy bearing bush is increased; and the recasting fund and time are reduced.

Description

technical field [0001] The invention relates to a welding repair method for a tin-based bearing alloy bearing bush. Background technique [0002] Tin-based bearing alloys have high anti-friction performance, good embedding, friction compliance and shaft resistance. The hard phase particles are evenly distributed in the soft phase matrix. The soft phase matrix makes the alloy have very good embedding, compliance and anti-seizure properties, and after running-in, the soft matrix is ​​concave, and the hard point is convex, so that a small gap is formed between the sliding surfaces to become an oil storage space and lubricating oil The channel is good for reducing wear, and the convex hard part acts as a support, which is good for bearing. [0003] Due to the above advantages, tin-based bearing alloys (babbitt alloys) are widely used in various types of bearing bushes on ships. Many rotating equipment in ships rely on the support of various bearings and lubricating oil to lubr...

AI Technical Summary

Problems solved by technology

However, oxyacetylene brazing and soldering iron welding are prone to undercut, incomplete penetration and pores

In particular, the oxyacetylene brazing process is complicated, it is easy to damage the parent body, and it may cause the volatilization of tin in the tin-based bearing alloy, which will cause the bearing pad to be more easily worn; and the use of soldering iron welding not only has a low repair pass rate, but also the repair is limited to the surface and cannot Repair the looseness of the base material