| by Kenneth Chase | 28 comments

Why and how to gas purge stainless pipes. TIG welding

Why and how to gas purge stainless pipes. Hello, everyone. Today we are talking about stainless pipe “Gas Purge.” When welding stainless pipes, it is common to create a gap between them and weld them. The outside of the pipe is protected by “Shield Gas” from the nozzle. However, the inside of the pipe is not protected by “Shield Gas.” This is carbon steel. Welding through gaps will not protect the back of the steel plate from shielding the shield. I’m going to weld this. Carbon steel does not oxidize even the back of an iron plate that is not directly protected by “Shield Gas.” However, if the stainless steel plate is welded in the same circumstances as before, the welds protected by shielding gas from the nozzle are normally welded. But the back of the steel plate without shield gas is exposed to the air. And the flowers that are oxidized bloom In the same situation, we will weld stainless steel plates. Welding area protected by shielded gas is normal. However, the back of the iron plate blooms with oxidized flowers. The same is true of stainless pipes. The inside of the pipe is not protected by shielding shielded gas from the nozzle. We will also try to weld the outside of the pipe. As you can see, the outside of the pipe is not oxidized. The inside of the pipe is a oxidized flower. However, there are some exceptions. Storage containers without pressure, structural pipes, vacuum lines with low pressure, sink, refrigerator, etc. In some cases, it may not be fully penetrated and welded. In such cases, welding is often done without “gas purge.” This depends on the company’s regulations or on the customer’s request. Now let me show you how to gas-purge and weld the inside of the pipe so that it doesn’t oxidize. First, “Tack” did it this way. Please note that one of my videos is about how to “Tack” the stainless pipe. First, connect the gas canister to the hose. You can inject gas into the pipe using a hose. At the end of the hose, I cut off the finger of the glove and attached it. Failure to do this will result in a “Wandering phenomenon” inside the pipe, as the gas is sprayed directly from the hose. That’s why I cut off the fingers of the gloves and This gently injects the gas into the pipe. You can use paper tape to connect the hose to the pipe. You can use this sponge. The thicker the sponge, the better the airtightness. This is how you connect the hose to the pipe. And then you inject it with purgis. This is what the pipe looks like inside. The opposite side of the pipe must be blocked from leaking gas. You can use a sponge to block the pipes. You can use paper tape. And there is a way to use glass tape. It is also recommended that you block between the two pipes. You can use a glass tape. Paper tape has better adhesion than glass tape. If you have a lot of money, you can use it a lot. This injects the purge gas and pulls the air from inside the pipe out. I’ll show you two ways. Purgigas are commonly used for algon gas or nitrogen gas. Since argon gas is heavier than air, it is filled from the bottom of the pipe. In contrast, nitrogen gas is lighter than air, so it is filled from the top of the pipe. For example, argon gas is filled from the bottom of the pipe. The air inside the pipe is then pushed by the argon gas and removed from the top of the pipe. The argon gas must be injected and the oxygen inside the pipe must be removed There are two ways. Please open the 12 o’clock tape. This will remove lighter oxygen than argon gas from the top of the pipe. To remove oxygen, drill a “Vent” hole in the top of the pipe. This removes oxygen from the top of the pipe. When purging with nitrogen gas, you can do the opposite. Nitrogen gas is filled from the top, so you can drill the Vent hole at the bottom of the pipe. Here’s how to make sure the inside of the pipe is purged well. You can also use a thin stainless steel plate. Or you can use a stainless spoon. Lift the iron plate between the gaps and weld just a little. If “purging” is successful, the back of the iron plate will not oxidize. If it’s not Purge, this is what happens. The back of the steel plate is oxidized to a gray You can check the purge gas pressure with your fingernails. You can use your lips when it’s hard to check with your fingernails. Because lips are thin, you can feel weak wind easily. It’s enough to feel the wind coming out of the gap of 12 o’clock when you check the pressure of the purge gas pressure. I’m going to show you the difference between welding with a lot of tape open and welding with a little When welding with a large amount of tape open, oxygen may seep through the gaps. The back-bead will then show a color other than white. So this is a different color. If “acid treatment ” or “electrolytic polishing” is performed after welding is completed, it does not necessarily have to be white. If it’s not oxidized, it doesn’t matter if it’s gray. However, the pipeline that does not post-processing after welding is recommended to come in white. It’s just for reference. The reason for this gas purge is to remove harmful gases, oxygen, vapor, etc. from the weld area. And the “purge gas” used is a lot of argon gas, nitrogen gas. Depending on the situation, mixed gas or helium gas can also be used. And there are materials that are not allowed to use nitrogen gas depending on the material. However, nitrogen gas has the advantage of being cheap. As such, the “purge gas” used depends on the welding situation, material, and price. It’s just for reference. So today, there are people who are curious about how to “purge,” so I made a video. I hope this video was helpful. Today I’ll finish with this. I’ll be back with another story next time. Thanks for watching.


gastrocnemius hamstring

Mar 3, 2020, 12:07 pm Reply

목소리보다 BGM 이 너무 커서 무슨 말 하는지 알아듣기 힙듭니다.
과도한 BGM 사용을 자제해 주세요.


Mar 3, 2020, 12:20 pm Reply


Yan hong

Mar 3, 2020, 12:23 pm Reply

설명 넘 잘 해요 감사 함니다


Mar 3, 2020, 12:29 pm Reply

Спасибо за видео все здорово !


Mar 3, 2020, 12:40 pm Reply



Mar 3, 2020, 12:40 pm Reply

아주 좋은 영상 감사합니다
잘보고 갑니다 빨간 입술은 재밌었습니다 ㅋ

weiyuan wu

Mar 3, 2020, 1:28 pm Reply


Dru Brawler

Mar 3, 2020, 2:03 pm Reply

Молодец. Буду использовать тест пластины. Привет из России.


Mar 3, 2020, 2:25 pm Reply

I woke up early in the morning and recorded my voice, and I think I'm still sober from drinking the day before.

My pronunciation is weird, so please use subtitles.

Ps. Excessive drinking can be an opportunity to seduce the lady next door. 😉
새벽에 일어나서 음성 녹음을 했더니 전날 마신 술이 덜깬것같습니다.

발음이 이상하오니 자막을 이용해주시면 감사하겠습니다.

Ps. 과도한 음주는 옆집 아줌마를 꼬실수 있는 기회?가 될수도 있습니다. 😉

Владислав Талабира

Mar 3, 2020, 3:02 pm Reply

Hello, you have a wonderful channel, I learned a lot about tig welding. In Russia, no one talks so well about welding methods. May I ask for advice. I need to weld 2 barrel rolls with a diameter of 750 mm in this way and I can’t make such a flow because of the large volume of the barrel roll

javier poblete

Mar 3, 2020, 4:02 pm Reply

excelente explicación 🙂

Vova Ylitsky

Mar 3, 2020, 4:43 pm Reply



Mar 3, 2020, 4:44 pm Reply



Mar 3, 2020, 6:33 pm Reply

Merci 👍

Günter Schöne

Mar 3, 2020, 7:13 pm Reply

Awesome video.
Very well explained and shown!

The trick with the steel plate is whether the pipe has been rinsed enough. I didn't know him yet, I was taught it with a handkerchief 🙂

Fernando Nautica

Mar 3, 2020, 7:18 pm Reply

Ótima dica, obrigado 👍👏👏👏


Mar 3, 2020, 8:49 pm Reply

출근하기전 시청했습니다
오늘도 수고 하세요 감사합니다! !

Adriana Vega

Mar 3, 2020, 10:30 pm Reply

Muy buena soldadura! Buena explicación🤗

Николай Питен

Mar 3, 2020, 2:23 am Reply

уважаемый. объясни как сварить пакет тонких трубок с одной толстой трубой.(пакет труб с шагом по диаметру. вложенных одна в другую . их нужно сварить с трубой трубой общего диаметра.)


Mar 3, 2020, 3:40 am Reply


Jay Roma

Mar 3, 2020, 5:39 am Reply

You bro your a sly fox trying your neighbour hope it went well and you welded everything in the right place bro anyway bro just keep at it you will nail her oops sorry meant you’ll nail the welding tutorial lol

Jacques Heusghem

Mar 3, 2020, 10:13 am Reply

Merci pour votre démonstration, bonne journée 👍


Mar 3, 2020, 9:03 am Reply

감사 해요, 질소와알곤 퍼지 방법이 다르다는 것을 알았네요,
의식 없이 작업한것이 부끄럽네요,

sang kim

Mar 3, 2020, 11:53 am Reply

잘 보고 있습니다만 배경 음악소리 좀 줄입시다.
설명보다 배경음악 소리가 더 크고 날카로워서 거슬리네요.

똥뿌리TV : 플룻 부는 용접사

Mar 3, 2020, 12:57 pm Reply

퍼지가 잘 됐는지 항상 입술또는 볼로 확인했는데… 얇은 판으로 확인하는 방법도 있었네요^^ 최고^^

Tan Rachid

Mar 3, 2020, 12:54 am Reply

Eres un crack no hablo coriano

Ababei Petrica

Mar 3, 2020, 9:55 am Reply


Hyun ik You

Mar 3, 2020, 3:03 pm Reply

삼겹살에 소주한잔 사고싶네여^^

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