Archie wrote:

In hard core racing, the same problems arose a number of years ago,
mostly in funny cars, but dragsters also. The common denominator,
other than various grades of stainless, was outside welds.
Now you may see some tack welds on the outside, but the actual
welding is done on the backside.(inside)
Also in current use is a tube within a tube.
I noticed the weld bead was quite wide, increasing the haz,
and may have contributed to the failure.
 Archie

 
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