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Difference between revisions of "Stainless Steel Welding"
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[[File:Stainless Steel Welding_1.jpg|thumb|200px|right|Stainless Steel Welding]] | |||
'''Stainless Steel Welding''' may not be as difficult as welding aluminum, the metal does have its specific properties that vary from your more common steels. | |||
To make a steel "stainless" it needs to contain a minimum of 12% Chromium (Cr). The Cr oxidises in the atmosphere forming a passive layer on the surface. This layer, unlike coated steels, is self repairing should it be scratched. | |||
The problem with 12% Cr is that it is fairly brittle and only provides the minimum corrosion resistance. Increasing the Chromium content to 17% improves corrosion resistance but increases brittleness. Adding 8% Nickel makes the steel ductile again. Thus 18/8 stainless was born (304). 316 / 316L has additional Molybdenum and higher Nickel which provides greater corrosion resistance. | |||
With stainless when you see two numbers they always refer to the Chromium and Nickel content - 18/8 is 18%Cr and 8%Ni. If you see 3 numbers like 19/12/3 they refer to the Chromium, Nickel and Molybdenum content. 316L is 19%Cr, 12%Ni and 3%Mo. | |||
The usual choice for the filler when welding stainless to mild is 309L. 309 is over alloyed stainless steel (19/10) so when diluted by the mild steel gives a deposit approximately like 308L / 304L. | |||
There are other fillers that give a crack free weld, 312, 308MoL, 307 and 310 will all work but these are less widely available than 309L. | |||
==Videos== | |||
<youtube>u1svgqqjLQs</youtube> | |||
<youtube>ANFXXKMRhfc</youtube> | |||