Re: [MW:36150] Guidance for welding Inconel 601 on tube mill for corrugated hose

Hello,

For orbital/longitudinal TIG welding of Inconel 601 at this gauge:

• Primary shielding: pure Argon (99.999%, welding grade) — standard choice for nickel alloys, avoid helium additions for thin gauge (helium increases heat input, which you don't want given your thermal buildup issue).
• Purge gas (ID of tube): pure Argon, with oxygen content held below roughly 20-50 ppm at the weld zone — nickel alloys need a tighter O2 threshold in the purge than stainless does. If your purge system was set up for stainless (which tolerates more O2), that alone could be your entire problem.
• Avoid any CO2 or O2 additions (sometimes used to improve arc stability on stainless) — these are not compatible with nickel-based alloys and will cause oxide-related weld degradation.
• Check that your trailing shield gas flow and coverage length are still adequate at whatever line speed you're running — nickel alloys generally need a longer/better trailing shield than stainless at the same speed to let the weld cool below the oxidation-critical temperature before exposure to air.

Marco Nunes

On Tue, Aug 18, 2026 at 2:43 AM sridhar cn <sridharcn305@gmail.com> wrote:

You have not mentioned the about 

The process, whether it is pulsed TIG or without pulse.

The shielding & purging gas and the type & grade of material used, including its thickness.

The welding parameters selected earlier and the size of the tungsten electrode used,

Does the breaking occur on the weld or in the HAZ—during or after welding? 

Is the crack noticed during the pre- or post-corrugated?

Any other technical information, like the heat input, hardness, penetration, fusion, weld width, 

type of cracks developed, etc.

Sridhar.

On Tue, 18 Aug 2026 at 08:13, Nikesh Bhansali <nikesh.bhansali@gmail.com> wrote:

I have a client who wants corrugated hose in inconel 601 grade . Currently we are able to make in stainless steel .

When we do production for inconel 601 corrugated hose , the welding stays consistent for a meter and then it breaks apart .

Thickness : 0.2mm

Does anyone have experience in welding Inconel 601 grade .

What gas do you recommend for the same ?

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