×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

QW-304

QW-304

(OP)
Does QW-304 prohibit the use of only Radiographic Examination for the performance qualification when using GMAW short circuiting mode?
If we read word by word, it looks QW-304 intends to prohibit RT only and does allow UT for performance qualification using GMAW short circuiting mode.

 

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: QW-304

Agreed.   RT for GMAW-S welder qualification is specifically prohibited.

For GMAW, we generally destrictively test because, frankly, its easier.  Plus, QW 191 adds a coupon thickness minimum of 1/2" which may be greater, in many cases, than the standard thicknesses used for testing.


From ASME IX:
QW-191.2.1 Method
(a) The ultrasonic examination in QW-142 for welders
and in QW-143 for welding operators may be conducted
on test welds in material 1⁄2 in. (13 mm) thick or greater.


 

RE: QW-304

(OP)
Section IX,

Taking consideration of QW-191.2.1 limitations, So I conclude UT can be used for performance qualification for GMAW Short Circuiting Mode. Correct?

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: QW-304

Here is what the 2010 Section IX QW304 states....

Alternatively,welders may be qualified by volumetric NDE per QW-191 when making a groove weld using SMAW, SAW, GTAW,
PAW, and GMAW(except short-circuiting mode for radiographic
examination) or a combination of these processes,...

Yes, UT must be used for welder qualification in lieu of RT or by mechanical test. The reason is short circuit GMAW increases the potential for LOF defects and they can be missed with RT versus UT.

RE: QW-304

(OP)
May TOFD be used to satisfy the requirements of QW-191 instead of manual UT?
 

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: QW-304

No TOFD, unless you can prove 100% coverage, and we know TOFD doesn't really examine the weld cap.  It is supurb for the bottom 4/5 of any weld.  But it won't really examine the cap.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources