Thread: dissimilar metals

HI,
Yes it is possible. It can be done with either 309 ss Arc Rods or Cig Weldall Arc Rods. There's probably other Rods that will do it too.

can definatly be done, I have done it with mig using standard mild steel wire, weld hold fine but will obviously rust.

Originally Posted by Jack-Plane

Hi Guys, Just a quick possibly stupid question, but is it possible to weld mild steel to stainless. I told a mate it was'nt but i thought i would check thanks for any feedback Paul.

Hi ,
Yes you can. Stainless steel and mild steel are still steel except stainless steel has more chromium in it which reduces corrosion. I generally use stainless filler rods on all my welds when using mild steel that are for hobby use projects, in other words non structural.

John

As John said stainless is still steel, just a different alloy. You can use either stainless or normal steel rods to weld it. I see no benefit in using stainless in welding mild steel as it will still rust unless it is treated. Best to use the same as the base metal and paint. I work in a winery where stainless and mild steel is welded together constantly. Stainless rods are used in this situation. I have done the same myself.

Stainless rods are very expensive to buy. They will still rust to a degree unless treated which is a very dangerous process which is being phased out in industry in favour of a process involving expensive electronic equipment. The original process involves an acid which if spilt on the skin will cause death if not treated straight away. Pickling is what it used to be called. Maintenance used to have an antidote type of chemical in their fridge when they were using it, in case of accidents. They don't use it anymore. Gone electronic.

The surface of stainless steel needs to be treated to return it to its original condition after heating from welding processes. My work had 50 tonne wine fermenters delivered from OS. They were transported on the front deck of a ship and suffered salt spray. They started to show rust and had to be treated to prevent this. An expensive and dangerous process involving insurance. Any weld spatter causes the same problem so cover the stainless.

Dean

you can use a gp if you like.