E-6010 vertical down too?

By Chavez Date 07-13-2001 22:56

Reading about E-7018 Downhand? topic (july 14,00), I am traing to know if that kind of considerations apply to E-6010 as well.
We have an internal spec. wich say taht it only apply vertical down.
the weldment will be for a 36" Dia 1" thk. API X52 welding in 6G position. the WPS indicate the root pass will be made uphill & the other beds downhill. I'm traing to know the best technical consideration and its support?

By pipewelder_1999 (****)

Date 07-14-2001 14:38

Root and hot passes in pipe have been successfully welded in both directions using E6010.

My preference is uphill only because I haven't been shown how to do it downhill and therefroe am not very good at it. People working on gas/oil pipelines do alot of downhill and from the ones I have seen are very good at it.

If your specifications and/or welding procedures indicate a specific vertical direction then I would stick with that.

By dong won oh (*)

Date 07-17-2001 23:42

You have to be careful about cracking at the root bead if you use downhill welding.
1) Reason
- low heat input due to high speed welding
- restraint is high
- hydrogen content at the weld is high with E6010
2) Considerations
- immediate 2nd pass welding after root pass
- preheating during welding
- use lower strength grade as possible

Dong Won Oh
South Korea