Mild steel welding is a very difficult process to do for the beginner in this industry, that’s for sure; in fact there are so many techniques for doing it. If you are really intent on asking this question, you first have to know what type of stainless steel product you are making and for what stainless steel uses will this product be for?
A mild steel weld is specific to each one of the stainless steel uses and the process in which the steel has to go through depends on all of those factors mentioned.
1. If you are in the food service industry, you need thick stainless steel metal or type 304 .063”. The counters, cookers, shelving and sinks all make use of this type of mild steel weld. They are prepared in such a way because this 304 stainless steel do not rust. This will prevent the trapping of bacteria and other harmful stuff onto the surface of the metal. To ensure that this is so, the back portion of these steel parts should be covered with argon. This is to make sure that the surface is all even out which will prevent bacteria like the dangerous salmonella to be live and multiply in uneven surfaces. To make the surface even, it should be brushed with a stainless steel brush; and then if there are mild steel welds that are not smooth, you can use an abrasive wheel to make it smoother and clean it well with alcohol.
2. In the aerospace industry they require the use of several types of stainless steel materials. They will need the austenitic types of stainless steel or 321, 304, 315 and 347. They may also require the use of the martensitic type of stainless steel like 410 and the some other stainless steel family. There are also other types of steel being used such as Greek Ascology, the Precipitation Hardening types, and Jethete M190. Those steel materials with 15 5ph, 15 7ph, 17 4ph, and 17 7ph are steel which have precipitation hardening properties. This means that if these materials are exposed to too much heat, they will harden. This makes them more difficult to weld than those in the 300 series. When it comes to welding, the common processes being used are the automated plasma welding and TIG welding.
3. The nuclear industry also uses a lot of different kinds of stainless steel and a specific requirement is for the steel to be TIG welded, especially the root pass part. The most common type of steel being used is basic 304L but the industry sometimes uses steel with 316 grades. In order to make better steel materials, TIG roots are combined with stick fill plus heavy wall pipe. However, this combination with stainless steel is hard to weld. On the other hand, pipes which are ½ inch or less in diameter are easier done with regards to orbital TIG welding. However, manual welding of pipe with smaller diameters might also be hard to accomplish.
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