Re: TIG welding of Large dia SS Pipe

We are using KOBELCO TGX-308L or TGX-316L filler rod for large diameter SS pipe where difficult to purge. This fillers are flux cored filler rod which produce slag to protect reverse side bead from oxidation by the atmosphere.

Don't forget, slags will be inside the pipe.

Tin Soe Thein

• Original Message ----- From: "Paul Bowers" <pbowers@pipingdesign.com> To: <PipingDesign@yahoogroups.com> Sent: Thursday, June 28, 2001 7:19 PM Subject: Re: [PipingDesign] TIG welding of Large dia SS Pipe

> For thin-wall (Sch. 10 and under) cryogenic service, we used to
> reinforce the piping at intervals inside the cold boxes to help
> correct out-of-roundness.
>
> Slip-ons were always used, since greater mass during cooldown was
> a startup heat-retaining problem.
>
> This probably doesn't help for the specific problem and it's a bit
> more complicated than that, but at least it's a reference point.
>
> Paul
>
>
>
> > this is fine Geoff. But please note the the lenght of those
> bladder are
> > quite long for large bore piping (SOCAP from Italy). Beside u
> stiil have to
> > find a way to insert the hose near the weld area pass the
> ballon.
> >
> > We've acutally tried quite a number of technique. We built a
> cage, inserted
> > the welder to perfrom back weld , then from the outside we
> ground/clean the
> > root then do the hot pass. If we're really in hurry, we put two
> welders -
> > one inside and one from the outside. Weld are perform almost
> simultaneouely
> > with the welders from the inside slightly ahead.
> > The 3rd method is to install the hat or dam fabricated out of
> carboard and
> > fitted from the inside around te weld joint. we then tape a
> masking on the
> > outside and perform the weld. The last is the use of dissolving
> paper to
> > create a dam around the pipe.
> > The first 2 tecnique actually eliminated the need for backing
> gas.- its the
> > oxiadation that you worry about with this type of welding.
>
>
>
> _____________________
> Piping Design Central
> [ http://www.PipingDesign.com ]
> ________________________________________
> We hope you find this newsletter useful.
> If not, you can unsubscribe at:
> <a href="/group/PipingDesign/post?postID=Q-DGG1fkVuvOYPirx0vatX8ZSV0qnBrNfkmzfv6lVjG1MVgrhdOFV_-KlyDS7sRgzanTtL69S3gAWgEbPGHSemTU4LuydjSnf4a_zM4r4EU">PipingDesign-unsubscribe@yahoogroups.com</a>
> Post message: <a href="/group/PipingDesign/post?postID=_fiUVZq1KhAcnKbnGAVOxEamaz86P_ppJlxfD4H5oe0wNwTTc3C6wvT9KoT3kwrHTYt9VvY8hBOeYWjg6Ym7B9a_U8Ax">PipingDesign@yahoogroups.com</a>
> Subscribe: <a href="/group/PipingDesign/post?postID=AFl1_qCtG6iAXPBuNxLDa9fb09AxPSLR6_L-zewe-yIQXwLjM5i8lvHikqvYINP0LT7x0gibAhizHYqrUyaZpVeUiTavlkXaLw0FUiFRaw">PipingDesign-subscribe@yahoogroups.com</a>
>
> Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a>
>
>
Received on Sun Jul 01 04:44:00 2001