Monday, July 20, 2009

[MW:2721] Re: blow holes in double side welding in H-Beam SAW welding

Sir,
This is to inform you that we are using two electrode SAW process.
Thanks,
Rohit Rawat,
Asst.Engg.(QA)

--- On Sat, 18/7/09, welding_engr_rich@charter.net <welding_engr_rich@charter.net> wrote:

From: welding_engr_rich@charter.net <welding_engr_rich@charter.net>
Subject: [MW:2709] Re: blow holes in double side welding in H-Beam SAW welding
To: materials-welding@googlegroups.com
Date: Saturday, 18 July, 2009, 6:26 PM


I am assuming that you are using the single electrode SAW process.
Typically blowholes on the second side are a result of flux being trapped
during the root pass on the first side boiling and escaping through the
molten metal of the second side weld. After the first side is done look
carefully at the send side weld prep, look for flux trapped in the root
area,

Wviness control you could try additional preheat this might help.  Contact
Tipmate http://tipmateusa.com/index.html their nozzle extensions might help
the waviness problem with a possible increase in production rates.

Best regards,
Richard Beldyk PhD, PE
AWS CWEng
ASNT NDT Level III

Original Message:
-----------------
From: raw rohit30584@gmail.com
Date: Fri, 17 Jul 2009 22:31:52 -0700 (PDT)
To: materials-welding@googlegroups.com
Subject: [MW:2702] blow holes in double side welding in H-Beam SAW welding



Hi everyone out there,
I am presently working in kirby building systems . we do PEB
fabrication .we use material ASTM A572 typ1 gr50 .the p[roblem is when
we do doubl;e side welding, blow holes occur in second side . what is
the basic reason .allso waviness occurs in flanges of thickness 6mm
and less,
thanks,
rohit rawat
QA(quality assurance)



--------------------------------------------------------------------
mail2web LIVE – Free email based on Microsoft® Exchange technology -
http://link.mail2web.com/LIVE



Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---

By -

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)

Re: [MW:35289] Welding consumable for S355J2WP material

S355 J2 WP  is a weathering structural steel  It has better atmospheric corrosion resistance. Use E 8018 - W1/W2  Electrodes This is regular...

  • Materails FAQs
    Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? ...
  • RE: [MW:5585] Buttering of weld joints
    Definition of buttering from ASME Section IX, QW/QB-492 Definitions:   Buttering:  the addition of material, by welding, on one or bot...
  • WELD AND WELDING SYMBOLS
    Section I. PRINT READING 3-1. GENERAL a. Drawings . Drawing or sketching is a universal language used to convey all necessary information to...