The Basic Research Of Laser Cladding Technology For The Universal Joint Fork's Repair

In this paper,by limit element analysis and experimental study of the universal joint s fork. Give the theory of the status of their movement and then According to the theoretical analysis choise several options process to cladding the fork Mouth. After welding several performance tests were done, based on these test results, select a best way .By finite element analysis, the Tiger's Mouth fork is the sine distribution force, which is under the rcycle of stress. According graphic method, fork in the theoretical calculated under a longer life. In the event of a source of the cracks, in accordance with the theory of fracture mechanics, cracks will slowly expand, which eventually led to the workpiece fracture. Based on the Paris theory that the first event of a fork crack source fork in the Tiger's Mouth will lapse after a few days. Therefore, welding cracks in the control is crucial, we must ensure that no cracks.Laser and plasma welding repair two methods Johannesburg surface. Which use laser welding with a powder, a kind of heat treatment, and do not use another kind of heat treatment; plasma surfacing using two different surfacing powder, respectively, and Ni-Fe-based, heat after heat treatment. Surfacing on the pattern followed by a stretch, hardness testing, impact, composition and microstructure analysis.Comparison of plasma and laser welding,laser welding have relatively small organization, laser welding, heat-treated # 2 surfacing of the most stable and changes in hardness, and the maximum hardness value; plasma surfacing Impact Performance is better than laser welding, laser welding of impact resistance is relatively stable, laser welding surfacing layer up to the maximum tensile strength of about 1050 Mpa, compared to the plasma surfacing about 800 Mpa, for very obvious advantages. Not only the greatest tensile strength, laser welding of weld overlay layers tensile rate is relatively stable, there are no major fluctuations.Comprehensive comparison can be drawn that #2 laser welding process is the best performance, so Universal joint fork should us`e the 2# laser welding process to repair .