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Science Forum Index » Engineering - Joining (Welding) Forum » galvanized to stainless steel...
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| Ed Atyeo... |
 Posted: Sun May 04, 2008 10:08 am |
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Hello, I mig welded 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 |
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| Ernie Leimkuhler... |
| Posted: Sun May 04, 2008 1:53 pm |
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In article <ojkTj.296$Yp.8 at (no spam) edtnps92>, Ed Atyeo <eatyeo at (no spam) telusplanet.net>
wrote:
Quote: Hello, I mig welded 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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| ... |
| Posted: Thu May 08, 2008 12:43 am |
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Guest
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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
Quote: 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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