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It is my understanding that the welds have to be normalized by controlled heating to prevent them from being brittle. The alloying of steel and chome (not Chrome plating) increases the strength allowing for thinner materials or wall thicknesses allowing for less weight & the same strength. All dimensions being equal there is no weight savings but immense increases in rigidity. I heve seen .035 wall material x 3" OD used in exhaust systems.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 12-30-2009 at 10:02 PM..
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