I'm trying to find out why an all-monel butt weld joint with no filler, just fused, is so much harder to get penetration depth than other CRA materials welded to Monel. We are fusing a .85 OD x.010 thick solid monel disk between two.850 OD x 1/2" ID monel tubes. We just fuse the parts together and require >.015" weld penetration. We section the welded assembly after welding to inspect the weld penetration. Unlike other nickel-based alloys, it is challenging to achieve the same penetration depths. The weld will not get much deeper than .015" despite trying different weld settings. It gets wider but not deeper. Many times .015 depth cant be achieved. I wanted to know why we have such trouble getting penetration with all monel joints vs others like Inc. 625 to Monel, or 316 to Monel. I attached a couple of images showing the weld pen depth for all monel joints. The materials are fused, with no filler. It's very wide and shallow unlike most that have .025 to .040 depth x .020 wide for a disk that's .01" thick.
Does anyone know why all Monel welded/fused joint is so difficult to achieve good penetration relative to other materials with the same Monel disk? I'm new to welding and hope my explanation makes sense.
Does anyone know why all Monel welded/fused joint is so difficult to achieve good penetration relative to other materials with the same Monel disk? I'm new to welding and hope my explanation makes sense.
