back purging
03-21-2009, 06:29 PM
#1
0.0 BAR
Thread Starter
Join Date: Mar 2009
Posts: 14
back purging
I tried finding this info maybe someone can show me the link or tell me more.
Can someone explain the best way to backpurge when welding (MIG) 304 stainless? 16-gauge.
Plan on building a cat-back for a TDI Golf. Pretty simple build really.
I have not done a lot of welding and just found out about the importance of back-purging. I figured since I spent the money on good bends in stainless, v-band clamps, etc I should backpurge.
Also... Solarflux
Seems like there are some very mixed reviews on here. I don't mind mixing it up. They claim it meets military and some other specs for welding. Thoughts?
What are your recommendations for wire (308?) and gas?
TIA
Can someone explain the best way to backpurge when welding (MIG) 304 stainless? 16-gauge.
Plan on building a cat-back for a TDI Golf. Pretty simple build really.
I have not done a lot of welding and just found out about the importance of back-purging. I figured since I spent the money on good bends in stainless, v-band clamps, etc I should backpurge.
Also... Solarflux
Seems like there are some very mixed reviews on here. I don't mind mixing it up. They claim it meets military and some other specs for welding. Thoughts?
What are your recommendations for wire (308?) and gas?
TIA
03-21-2009, 06:32 PM
#2
0.0 BAR
Thread Starter
Join Date: Mar 2009
Posts: 14
I tried the link in this sticky but it just re-directs me to the main page:
https://www.homemadeturbo.com/forum/...formation.html
https://www.homemadeturbo.com/forum/...formation.html
03-23-2009, 12:51 AM
#3
3.0 BAR
Join Date: May 2005
Posts: 1,811
solarflux sucks. its too expencive compaired to the minute amount of argon needed to purge this size piping.
if you dont want to build some caps shove a line running around 5cfh into one end of the pipe, surround it with some bread, close off SOME of the other end. if you close the whole end off, letting the argon pressurize the pipe it will blow holes in your welds.
if you dont want to build some caps shove a line running around 5cfh into one end of the pipe, surround it with some bread, close off SOME of the other end. if you close the whole end off, letting the argon pressurize the pipe it will blow holes in your welds.
03-25-2009, 08:05 PM
#5
3.0 BAR
Join Date: May 2005
Posts: 1,811
stainless
magnesium
ti
duplex, alloy & nickel steels
some nickel alloys
some copper alloys
should all be back purged
the only time you wouldn't want to back purge stainless is on your own personal piping if you are cheap
aluminum does not require a backing gas. however, it can be very helpful at more manly feeds and travel rates to use a copper backing plate to prevent burn through.
both aluminum and mild steel benefit from backpurging, however at lower dimensions, feeds & travel rates it is not critical to getting good weld quality.
magnesium
ti
duplex, alloy & nickel steels
some nickel alloys
some copper alloys
should all be back purged
the only time you wouldn't want to back purge stainless is on your own personal piping if you are cheap
aluminum does not require a backing gas. however, it can be very helpful at more manly feeds and travel rates to use a copper backing plate to prevent burn through.
both aluminum and mild steel benefit from backpurging, however at lower dimensions, feeds & travel rates it is not critical to getting good weld quality.
03-26-2009, 07:09 PM
#7
0.5 BAR
Join Date: Mar 2009
Location: Richmond, VA
Posts: 119
stainless
magnesium
ti
duplex, alloy & nickel steels
some nickel alloys
some copper alloys
should all be back purged
the only time you wouldn't want to back purge stainless is on your own personal piping if you are cheap
aluminum does not require a backing gas. however, it can be very helpful at more manly feeds and travel rates to use a copper backing plate to prevent burn through.
both aluminum and mild steel benefit from backpurging, however at lower dimensions, feeds & travel rates it is not critical to getting good weld quality.
magnesium
ti
duplex, alloy & nickel steels
some nickel alloys
some copper alloys
should all be back purged
the only time you wouldn't want to back purge stainless is on your own personal piping if you are cheap
aluminum does not require a backing gas. however, it can be very helpful at more manly feeds and travel rates to use a copper backing plate to prevent burn through.
both aluminum and mild steel benefit from backpurging, however at lower dimensions, feeds & travel rates it is not critical to getting good weld quality.
From all this I take it that you weld everyday for a living?
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