Rail Gas Pressure Welding with Short Upset Distance Using Variable Pressure Method

Abstract

In order to reduce the bulge of gas pressure welding and finish by grinding only, the authors carried out rail gas pressure welding tests and numerical analysis to reduce the upset distance. In the tests, a new rail gas pressure welding method using a variable pressure method was achieved with a compression of the upset distance of about 6 mm, which is 1/4 of the conventional method, with sufficient strength for practical use. As the trimming process is not necessary, there is no need for a trimming device. This also reduces the weight of gas pressure rail welding machines.