Hello What do you think about welding pipes of a gas installation with an electrode? Is it possible and will it be tight?

And seriously, logic allows you to be the first to check it ..? Go to a person who knows it, and by the way you will see how it should be done and you will have the answer

I guess hard soldering is not welding.

For a welder, yes, for a layman there are professional services. Ensuring tightness or testing it for an installation operating up to ~ 40mbar, not transmitting stresses other than those resulting from thermal expansion and own weight, is not rocket science. After that, a long time ago, copper and soldering went under the thatch.

It's about an old installation. and moving the stove. I will not do it, only the installer who says that it is not possible to weld gas, but it is electrically welded. With tond Hence my question. Thank you for your opinions. As in the subject, will it be a permanent and tight connection? Or to look for another professional.

Such a weld should be tested for tightness. There are different methods. He should stamp what he did.

New or modified installations in the apartment must be brazed (copper pipes) or welded (seamless steel pipes). It is not written whether gas or electric welding. threaded connections are allowed in places where welding is not possible (e.g. at a gas meter). Installation can only be performed by a specialist installer who has a valid exam and will sign the work.

And what, this stump cannot be threaded? Put on nipples, elbows or fittings?

After cutting, plug the hole after the stove connection three meters further, stick to the same connection to the stove and the pipe goes further to the bathroom stove.

And you can not cut it and thread it and insert a tee ?? You will also need some space for welding.

You need a professional company. Welding / cutting a hole in the pipe in the present case, I call stupidity. Colleagues do well - fittings and a specialist.

[Solved] Welding Gas Installation Pipes in Apartment: Electrode Use, Possibility & Tightness

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#1 17160869 10 Apr 2018 22:03

marqqv marqqv

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17160869 10 Apr 2018 22:03

Hello
What do you think about welding pipes of a gas installation with an electrode? Is it possible and will it be tight?
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#2 17160943 10 Apr 2018 22:38

szymon122 szymon122

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17160943 10 Apr 2018 22:38

marqqv wrote:
Is it possible and will it be tight?

And seriously, logic allows you to be the first to check it ..?

Go to a person who knows it, and by the way you will see how it should be done and you will have the answer
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#3 17160975 10 Apr 2018 22:50

Doominus Doominus

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17160975 10 Apr 2018 22:50

I guess hard soldering is not welding.
#4 17160978 10 Apr 2018 22:51

Anonymous Anonymous

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17160978 10 Apr 2018 22:51

marqqv wrote:
Is it possible
For a welder, yes, for a layman there are professional services.

Ensuring tightness or testing it for an installation operating up to ~ 40mbar, not transmitting stresses other than those resulting from thermal expansion and own weight, is not rocket science. After that, a long time ago, copper and soldering went under the thatch.
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#5 17161265 11 Apr 2018 07:53

marqqv marqqv

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17161265 11 Apr 2018 07:53

It's about an old installation. and moving the stove. I will not do it, only the installer who says that it is not possible to weld gas, but it is electrically welded. ~~With tond~~ Hence my question. Thank you for your opinions.
As in the subject, will it be a permanent and tight connection? Or to look for another professional.
#6 17161275 11 Apr 2018 08:03

SKM 1964 SKM 1964

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17161275 11 Apr 2018 08:03

Such a weld should be tested for tightness. There are different methods. He should stamp what he did.
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#7 17161276 11 Apr 2018 08:04

MARCIN.SLASK MARCIN.SLASK

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17161276 11 Apr 2018 08:04

New or modified installations in the apartment must be brazed (copper pipes) or welded (seamless steel pipes). It is not written whether gas or electric welding. threaded connections are allowed in places where welding is not possible (e.g. at a gas meter).
Installation can only be performed by a specialist installer who has a valid exam and will sign the work.
#8 17161278 11 Apr 2018 08:04

Krzysztof Kamienski Krzysztof Kamienski

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17161278 11 Apr 2018 08:04

And what, this stump cannot be threaded? Put on nipples, elbows or fittings?
#9 17161322 11 Apr 2018 08:42

marqqv marqqv

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17161322 11 Apr 2018 08:42

After cutting, plug the hole after the stove connection three meters further, stick to the same connection to the stove and the pipe goes further to the bathroom stove.
#10 17163192 12 Apr 2018 08:54

SKM 1964 SKM 1964

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17163192 12 Apr 2018 08:54

And you can not cut it and thread it and insert a tee ?? You will also need some space for welding.
#11 17164235 12 Apr 2018 20:15

jalop jalop

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17164235 12 Apr 2018 20:15

marqqv wrote:
After cutting, plug the hole after the stove connection three meters further, stick to the same connection to the stove and the pipe goes further to the bathroom stove.

You need a professional company. Welding / cutting a hole in the pipe in the present case, I call stupidity. Colleagues do well - fittings and a specialist.
#12 17164541 12 Apr 2018 22:08

marqqv marqqv

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17164541 12 Apr 2018 22:08

The topic is closed with an electrically welded pipe, without any problems, tightness checked. You do not need a company but a decent professional who knows what he is doing. In general, it is possible to ask for it and it is tight.

I close and greet, thank you for the posts.
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Topic summary

✨ The discussion revolves around the feasibility and safety of welding gas installation pipes in an apartment using electrodes. Participants emphasize that while welding is possible, it must be performed by a qualified professional to ensure tightness and compliance with safety standards. Alternatives such as brazing copper pipes or using threaded connections are also mentioned. The importance of testing the weld for tightness is highlighted, and it is noted that proper installation should be documented by the installer. The conversation concludes with a confirmation that electrically welded pipes can be tight and safe when done correctly.
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FAQ

TL;DR: Apartment gas lines run at approx. 40 mbar; welding “is not rocket science” when a qualified installer tests and documents it. Electrode welding or threaded fittings can be appropriate. [Elektroda, Anonymous, post #17160978]

Why it matters: For apartment owners and installers moving or modifying gas lines, this explains safe joining choices and leak‑testing so work stays tight and compliant.

Quick Facts

Low‑pressure apartment gas installations operate at approx. 40 mbar; joints should carry only thermal‑expansion and self‑weight stresses. [Elektroda, Anonymous, post #17160978]
Allowed methods: braze copper or weld seamless steel; use threaded connections only where welding isn’t possible (e.g., at a gas meter). [Elektroda, MARCIN.SLASK, post #17161276]
Every welded section should be tightness‑tested, and the installer should document it with a stamp/record. [Elektroda, SKM 1964, post #17161275]
Electrode (electric) welding was used successfully in this case, with leak‑tight results confirmed after testing. [Elektroda, marqqv, post #17164541]
Avoid cutting holes into existing lines to branch; use fittings and a specialist for safer results. [Elektroda, jalop, post #17164235]

Can I weld apartment gas pipes with an electrode and still keep it gas‑tight?

Yes—if a qualified welder performs the work and the joint passes a leak test. Domestic apartment lines run around 40 mbar, so achieving tightness is manageable with proper prep. Avoid adding mechanical stresses to the joint beyond thermal expansion and its own weight. If you are not a welder, hire a professional service. Always verify tightness after the modification. [Elektroda, Anonymous, post #17160978]

Is brazing the same as welding for gas installations?

No. Brazing (hard soldering) and welding are different joining processes. As one forum expert put it, “hard soldering is not welding.” Your installer will choose the correct method for the pipe material and location. Keep method selection tied to material and approved practice. [Elektroda, Doominus, post #17160975]

What joining methods are typically allowed inside apartments?

Use brazing for copper and welding for seamless steel. Threaded connections are permitted only where welding cannot be done, such as near a gas meter. This approach aligns with common residential practice noted by experienced installers. Confirm the chosen method with your certified installer before work begins. [Elektroda, MARCIN.SLASK, post #17161276]

Who can perform and sign off a gas pipe modification?

A specialist installer with a valid exam should perform the job and then sign the work. That signature ties responsibility to the person who completed the modification. Ask to see current credentials before work starts. Request documentation at handover. [Elektroda, MARCIN.SLASK, post #17161276]

How do I verify tightness after gas pipe welding?

Follow a simple check with your installer:

Ask the installer to perform a tightness test on the modified section.
Observe the approved test method used and its result.
Request written confirmation; “He should stamp what he did.” This gives traceable proof of leak‑tightness. [Elektroda, SKM 1964, post #17161275]

Is it okay to cut into an existing pipe to add a branch?

Avoid cutting or drilling holes to branch lines. A seasoned pro called that approach unwise for your case. Instead, have a specialist use the right fittings (e.g., tees) and proper techniques. This reduces risk and simplifies testing and documentation. [Elektroda, jalop, post #17164235]

When should I choose threaded fittings instead of welding?

Choose threading where welding isn’t possible or advisable, such as in meter areas or tight spaces. Threaded connections allow safe assembly where open flames or welding clearance are restricted. Confirm thread quality and always perform a leak test after assembly. [Elektroda, MARCIN.SLASK, post #17161276]

Can I weld near the gas meter, or must I thread there?

Use threaded connections near the gas meter. That area is cited as an example where welding is not performed. Plan for accessible threading and assembly space, and complete a documented leak test afterward. [Elektroda, MARCIN.SLASK, post #17161276]

What pressure do household gas installations work at?

Typical apartment gas installations operate at approximately 40 mbar. Work methods and leak tests should suit low‑pressure service. Keep joints free of extra mechanical loads to maintain tightness at this pressure. [Elektroda, Anonymous, post #17160978]

What can cause a welded joint to leak later?

Introducing loads beyond thermal expansion and the pipe’s own weight can compromise a joint. Poor alignment or supports can add stress and create leaks over time. Always test after work and ensure proper supports to avoid unintended loading. [Elektroda, Anonymous, post #17160978]

I’m moving a stove about 3 meters—what’s the recommended approach?

Engage a specialist and extend the line using proper fittings and approved methods. Avoid ad‑hoc hole cutting into existing piping. Plan the route, use tees and elbows as needed, and complete a documented tightness test when done. [Elektroda, jalop, post #17164235]

Is electric (SMAW/electrode) welding acceptable versus gas welding here?

Yes. The guidance referenced does not mandate gas versus electric; it requires welding for steel where applicable. A qualified installer selects the process and proves tightness afterward. Request documentation of the completed test and their credentials. [Elektroda, MARCIN.SLASK, post #17161276]

Do I need a full company, or is a single certified pro enough?

A competent professional completed this type of work and confirmed tightness without involving a large company. The key is proven competence and a verified leak test at the end. Ask for test results and keep the documentation. [Elektroda, marqqv, post #17164541]

What space or access should I allow for welding?

Provide sufficient space for safe welding and inspection. If access is too tight, use threaded fittings instead of forcing a weld. Plan clearances in advance to speed work and help the tester reach every joint. [Elektroda, SKM 1964, post #17163192]

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