wellhead welding 1

[91873634542]

We will do wellhead welding in offshore.
Wellhead material AISI 4130 and its casing using K55.
What electrode should be used ? ER80S-G / E10018-D2 or E6010 / E7018 or any option ?
Thanks in advance

 

[jbeckhou]

You need a WPS/PQR to weld 4130. Just guessing is going to kill someone.

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[Guest102023]

I've seen too many cases of welding non-experts insisting on 'matching' filler metal when joining low alloy metals like these. The alloy in the filler metal combined with the carbon picked up from the 4130 makes for potentially very high hardness.
As mentioned, do some trials and a PQR that includes hardness testing.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[weldstan]

E6010 should be discounted because of hydrogen cracking concerns. I have used ER70S-2/E7018 for similar welds but cannot provide other recommendations without further design conditions.