Stainless steels can be welded using several different procedures such as shielded metal are welding, gas tungsten arc welding and gas metal arc welding.
These steels are slightly more difficult to weld than mild carbon steels.
The physical properties of stainless steel are different from mild steel and this makes it weld differently
These differences are:
Lower melting temperature.
(1) Lower coefficient of thermal conductivity.
(iii) Higher coefficient of thermal expansion.
(iv) Higher electrical resistance
The properties are not the same for all stainless steels, but they are the same for those having the same microstructure.
Regarding this, stainless steels from the same metallurgical class have the similar welding characteristics and are grouped according to the metallurgical structure with respect to welding.
When welding stainless steel use a heat sink such as brass or aluminum. This absorbs the heat and also prevents any burn through.
When we get to the end of the weld and pull the heat off it always tends to turn a dark gray. That’s because we are carrying all the heat with us and by the time we get to the end it’s at its hottest point
Wait until the weld pool solidifies and then touch the tungsten to the metal and hold it there till our gas stops flowing. Will notice that the colour will come back to the weld. Depending on how long we touch the tungsten to the end of the weld.
We can actually get that nice salmon colour back. We would add hat channels to give the stainless steel tables more stiffness. Any welding would be done on the channels and not the actual table. This keeps it looking clean.
