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Posted by on May 8, 2008, 6:43 am
Please log in for more thread options i suggest the following ,
try to remove skin of galvanised portion and weld ,
if the zn is stripped by muriatic acid and welded if the outcome is
same like cracks,
pl inform what is the thickness of pipe and gi portion .
what is the ambient temperature.
cooling rates are high there is possibility of hard structures which
leads to crack etc.
vbravi
ded a galvanized ring to a stainless pipe(304) using 309
> > wire and a tri-mix gas. The pipe was 12" o.d. and got a lot of cracks in the
> > weld and inside the pipe in the stainless. The pipe I am making is blow pipe
> > so Im concerned about leaks, but I can not figure out why it cracks. The fit
> > up was good , no cross wind ect. I have tried 308 wire and get the same
> > results. Any thought or comments is greatly appreciated. Thank you -Ed
>
> Contamination from the zinc.
>
> Dip the galvanized part is Muriatic (Hydrochloric ) acid as used for
> etching concrete.
> The acid will strip the zinc off in a flash, but make sure to do it
> outside and wear goggles.
> You can buy it by the gallon at Home Depot or Lowes.
>
> After stripping, rinse in water with some baking soda dissolved in it.
> That will stop the acid.
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> wire and a tri-mix gas. The pipe was 12" o.d. and got a lot of cracks in the
> weld and inside the pipe in the stainless. The pipe I am making is blow pipe
> so Im concerned about leaks, but I can not figure out why it cracks. The fit
> up was good , no cross wind ect. I have tried 308 wire and get the same
> results. Any thought or comments is greatly appreciated. Thank you -Ed
>
>