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Purging TIG Welds, Here's Why & How
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- čas přidán 15. 08. 2024
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What is back purging and why is it critical in motorsport fabrication TIG welding?
Purging is the process of removing the oxygen from the inside of an enclosed part prior to TIG welding. Removing oxygen from inside the part protects the back of the weld from oxidation due to the high heat of TIG welding enhancing the quality of the weld. This, in turn, maintains the corrosion resistance of parent materials, ultimately reducing leak rates and even structural failure risks of your finished work.
It is straightforward to tell the difference between a correctly purged and an unpurged or insufficiently purged weld, and in this lesson you will see examples of both.
Note we are talking about back purging in relation to motorsport fabrication applications and in other industries where you are dealing with much larger diameter pipe and tube etc, what is considered best practice may be different for various reasons.
There has simply never been a better time to purchase your first or upgrade your existing TIG welder. Advances in technology mean that inverters are helping us use TIG welders with higher and higher outputs in the home workshop without the need for 3-phase power or a ton of spare storage room.
This is just one module from a full TIG welding course that is designed to help you learn how to weld at home or help speed up what you are doing at the workplace as you get started. If you want to check out the full course, you can find it here: hpcdmy.co/p-tig-y
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TIME STAMPS:
0:00 - What Is Purging?
0:28 - Why Do We Purge Our Welds?
0:42 - Stainless Example Plan
0:52 - Poor Fit Up, Poor Purging
1:24 - Tack Welding Using Kapton Tape
1:47 - Do You Purge Your Tack Welds?
2:01 - Sealing Your Tube Options
2:18 - Silicone Plugs
2:30 - Masking Tape
2:36 - Argon Filling Tip
2:48 - Purging Bottle Options
3:07 - Gas Flow Rate Rule Of Thumb
3:35 - Not Instant To Fill
4:14 - Position Of Your Weld
4:28 - Spend Some Time Practicing And Inspecting
4:37 - Vent Argon, Don't Pressurise
4:54 - Do You Change Your Technique When Purging?
5:09 - Purged Vs Un-purged Example
5:38 - Do It Once, Do It Right
5:56 - Learn More On TIG Welding And Motorsport Fabrication
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#highperformanceacademy #backpurging #purge #welding #weld #weldporn #tig #tigwelding #fabrication #builddrivetune #racecraft #argon #unpurged #motorspor #motorsports #tube #pipe #steel #stainless
Who's your favourte online welding tool and material supplier? - Taz.
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TIME STAMPS:
0:00 - What Is Purging?
0:28 - Why Do We Purge Our Welds?
0:42 - Stainless Example Plan
0:52 - Poor Fit Up, Poor Purging
1:24 - Tack Welding Using Kapton Tape
1:47 - Do You Purge Your Tack Welds?
2:01 - Sealing Your Tube Options
2:18 - Silicone Plugs
2:30 - Masking Tape
2:36 - Argon Filling Tip
2:48 - Purging Bottle Options
3:07 - Gas Flow Rate Rule Of Thumb
3:35 - Not Instant To Fill
4:14 - Position Of Your Weld
4:28 - Spend Some Time Practicing And Inspecting
4:37 - Vent Argon, Don't Pressurise
4:54 - Do You Change Your Technique When Purging?
5:09 - Purged Vs Un-purged Example
5:38 - Do It Once, Do It Right
5:56 - Learn More On TIG Welding And Motorsport Fabrication
Wadding up a piece of aluminum foil is also another method of blocking the end of a tube. On a long tube, it is possible to shove the foil ball into the tube to reduce the volume to save on
the inert gas.
Reynolds Cap
Another option is to use Solar Flux type B on the backside of the weld. Not beautiful, but much easier and does a very adequate job of shielding the backside of the weld without the fuss, hassle and argon expense of a back-purge.
I could see that being pretty useful for certain situations like welding flanges to tubing where it is difficult to adequately cover up to hold argon and still provide clearance to make the weld.
Awesome info as always
Yup these People never fails 🤘
Because I primarily weld on the top of the tube I back gas with Helium. Cost more but I use less.
absolutely love the presentations. So much knowledge shared- Thank you!!!
You should contact TIG Aesthetics for input, one of best friends and of course, fellow fabricator.
You might recognise some of the equipment here if you're a fan of TIG Aesthetics too 😉 - Taz.
@@hpa101 We're best homies in real life actually. Brad is a legit dude.
When welding big pipes I use a lighter to see if it kills the flame on the end where its blowing out the gas
Does it blow it out like wind?
@@kevinaguilar6948 yes it instantly kills the flame if there is enough argon inside
@@zundappwatercooler perfect I’ll keep that in mind thank you 🙏🏼
LET'S GO!!!🏁
#notificationgangassembleeeeee
@@hpa101 Sorry, was too busy watching this on the gram 15min ago to be here. 😛
@@hpa101 😄
Stupid question, can you use shaving foam, or shaving gel on the back side as a purge method?
Looks like a good solution to an ABS setup. Q do you know the maths behind sizing up the maser cylinder to use? Cheers
thank you to showing how does it look inside, but your pipe is at least 2mm thick, and you use add rod at least 1.2-1.6mm thick, ( i did it on 1.5mm thick pipe) and welds inside when purged look great but it still reduces inner diameter of pipe and are not slick as pipe is and it would be better to flat it by grinding
Use smaller wire ?
@@kevinaguilar6948 i used 1mm wire , and 36-38 amps on 1.5mm thick pipe and i had to be fast otherwise it would be made hole
where i work/learn welding stainless steel we dont use lens cups we only use stubby is there a reasson for?
They want to be cheap? Stainless does require a lens but it def helps get better results. Many jobs don’t have them due to price and the lens can get dirty and need more replacing
Will MIG gas be OK for purging?
No, it contains CO2 which is a reactive gas and reactive gasses are what cause the issues the we're trying to avoid by doing this.
You want inert gasses for purging/shielding like pure argon or a mixture of argon and helium.
Hope that helps, great question - Taz.
Last time I attempted a purge, I was tigging a Sched 10, 3" Stainless Steel pipe, no gap on the joint, my amps at 90. I was told to keyhole the root pass but couldn't for the life of me. It looked like fuckin garbage. I just kept heating up my arc in one spot hoping it would open up my keyhole but no luck. Any advice?
What’s that tool you used to clean the pipe the blade looking
Its called a 'deburring tool' 👍🏻
I know how to. I just never do lol
Why not? - Taz.
@@hpa101 back purging is for the rich haha
I thought doing things twice was for the rich 😂
I'm being dramatic, but I was just interested to hear if there was another reason old mate had aside from time or cost - Taz.
@@hpa101 time, cost, equipment. If I was doing upstream from a turbo stuff I would but just not quite as important for post turbo duty.
⚡🖌⚡ = tig
⚡🔨⚡ = stick
⚡💩⚡ = mig
😀 brought to by the welders against squirt guns gang