Super_TIG 2층 클래드용접에서 용입제어 방법에 관한 연구

Abstract

Demand of Clad welding increases that plant industry has developed. It improves the surface property of material and it is a method of surface treatment by deposited welding material such as Ni-alloy having wear resistance, corrosion resistance, heat resistance that on the base metal surface uniformly. The Super_TIG welding that uses the C-type Strip ; the plasma stream projections the whole strip surface at a right angle, therefore it has the advantage of increasing the deposition rate by maximizing the melting efficiency. TIG Clad welding are made usually deposition design to the 2layer on the surface of the carbon steel. The Layer1 has deposited on the carbon steel and the Layer2 has deposited on the Layer1. The Layer1 Melting Point is a lot lower than the carbon steel so if you welding under the same conditions, penetration of Layer2 will becomes deeper than penetration of Layer1. so the dilution rate of Layer2 is increased. In the study, review the effect on the penetration while change the torch progressive angle in Super_TIG welding. and review the effect on the penetration control of Layer1 while change the current in the single bead. eventually confirmed relationship between Current and penetration. also performed a study to take shallower than the penetration of Layer2. As a result, if the feeding angle is constantly on 20 degrees and if the progressive angle increases tend to decreases the penetration was confirmed. When the progressive angle reaches 40 degrees or more, the plasma stream rises up the strip and the melting of the filler metal becomes irregular so where the torch is suppose to go over the base metal the spatter just sticks on it, when the Oscillation starts the strip gets stuck on the spatter and makes the feeding faulty.