Below are a few more tips about how to weld stainless steel. You can find out more online. If there is a limit amount of ferretic in an otherwise austenitic material it tends to be much easier to weld.  Use small burst from the arc to make the weld. If you have rods that are  it takes a DC current welder to get a decent weld. Use the lowest possible heat. They do not tend toward hot cracking. 

They are Ferric, Austenitic, Duplex and Matrensic. You must first clean the piece thoroughly. This is only a small portion of what you need to know in order to do a really good job of the weld.. So you see, there are a lot of things to consider when welding stainless steel. It has a propensity for hot cracking that makes it almost not worth the time or energy to weld. 

There is also a mixed class called Duplex, and it is recognized by their metallurgical structure, to be more precise by their microstructure. It should be done in  second intervals, following this procedure will also help you to keep the pieces in alignment. For welding stainless steel use stainless rods only. Not all of he 300 series respond well to welding as in the case of the 303. Any one that ends with is what you want to use with a AC current type welder. Welding Ferritic Stainless Steel This material responds better if you use the arc welding process. Using a wire brush to aggressively scrub the surface should do the trick. This is to remove any chromium particles that have built up over time and also dirt, grease and other contaminants. Stainless steel comes in such thin sheets it can be easily warped. Tip for Welding Austenitic Steel These are the ones tha tare considered to be the best for welding. 

Most car exhaust systems are made of ferritic materials.Before jumping right into the welding tips it is important that everyone reading this understands that there are different types of stainless steel and they are not all welded the same. To take a good weld it needs to be clean. Starting out as cool as possible and increasing gradually if needed will prevent you from totally destroying the material. There are in fact three classes of the product we call stainless steel. When purchasing stainless steel you will no doubt here them called the "300 series", that is their classification form the American Iron and Steel Institute. There is a China Straight Union Factory big difference between using a rod and an electrode.

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