Non-equal Strength Repair on Surface of Damping Oil Seal Area of A Large-Sized Shaft by Silver Brazing
The surface of damping oil seal area of a large-sized 42CrMo4+Ni+V shaft was damaged due to some reasons.In order to recover the oil seal function and geometric dimension of the damaged area,non-equal strength repair of the surface was carried out by using silver brazing process.Firstly,a simulated sample was specially made,and pre-welding procedure specification was formulated to carry out the qualification test.The tensile test,impact test,metallographic structure analysis and hardness test were carried out for the same area of the simulated sample before and after welding.The analysis shows that the heat affected zone range is about 2 mm,and using the silver brazing repair has a little effect on the structure and mechanical properties of the base metal and it is feasible to repair the damaged surface.Finally,the silver brazing process is successfully applied to the damaged surface repair of damping oil seal area of the large-sized shaft.
large-sized shaftdamping oil seal areanon-equal strength repairsilver brazingsimulated sample
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