Buttering weld

Date 10-12-2010 14:53

Dear experts,

Need an advice regarding weld build up thickness to the internal vessel body.
Original body plate thickness is 28.0mm, maximum pitting depth is 12.0mm & affected repair area approximately 800x150mm.

1. Which process is the best method for repairing between SMAW & TIG regarding welding speed, weld quality, etc.
2. Is it allowed if using normal WPS (butt weld) for this buttering work due to no penetration weld for this repair, or overlay WPS should be selected?

Please advice.

qcweld

By ssbn727 (*****)

Date 10-13-2010 13:01

Hi qcweld!

First off, "WELDCOME TO THE WORLD'S GREATEST WELDING FORUM!!!:) :) :)" Now that I've got that out of the way...
Need more info... Such as what materials are are you working with, what is the governing code or standard, application, intended service etc.

In other words, please provide us with as much information related to your query as you possibly can so we can give you an informed response or as close to one as possible. ;)

Respectfully,
Henry

By qcweld

Date 10-14-2010 04:16

Thanks Henry for the reply,

The arrangement is:

1. Material used is SA 516 Gr.70.
2. Applicable code is ASME VIII Div.1 or API 510. Need help regarding in service repair application code. Which one should be selected.
3. Welding process selection either GTAW/SMAW regarding their speed, quality, costs..etc.
4. Service: Gas Scrubber Vessel (ID 12.0m).
5. WPS selection either normal groove WPS or Weld overlay WPS?

Hope above details should give you much info to working out this matter.

Best Regards,
qcweld.

By js55

Date 10-14-2010 10:37

SMAW is cheaper and faster. GTAW can give you higher weld quality but not necesarily so. Depends on what you mean by quality. The primary difference will be the oxides that exist in the SMAW weld deposit from the flux reactions. But so what?
Use a standard WPS. You are not doing overlay. Though there is obvious similarity. The overlay qualifications are intended to achieve a specific purpose of which you are not concerned. You are doing a base metal repair.
Now if you are going to be utilizing a corrosion resistant type alloy like SS then you might fall into corrosion resistant overlay intent.