×
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

heat input restriction

heat input restriction

heat input restriction

(OP)
Dear friends
please say the range of heat input in LTCS (a333 gr6)welding and which std reference for this?

RE: heat input restriction

There is not a range; only the maximum heat input used during procedure qualification. With proper choice of welding filler metals (composition) and welding processes, I have readily met -50F and lower with heat inputs up to 70 KJ/in.

RE: heat input restriction

weldstan, what/how did you get 70KJ/inch at -50°F ?? Could you get it with a 'field' process like SMAW or GTAW? Any and all info will be greatly appreciated, sir.

[i suspect there will be an SA-333 project in my near future]

RE: heat input restriction

With GTAW and SAW.

I have often met up to -60F impact requirements with SMAW at 55+ KJ/in. In one instance in England, the original PQR referenced a heat input < 20 KJ/in. Both the client and I knew that the welders would never adhere to the requirement and as a result we witnessed qualification of a production weld made in the 5G position, recording and calculating a heat input of 53 KJ/in. It passed easily meeting absorbed value at -60 F using an E8018-C3 electrode and a GTAW root pass with 1% Ni bare wire filler metal. We then had them requalify a number of other similar "too low to be believed" heat input procedures to address the remainder of the work under B31.3.

We have typically qualified our low temperature (-50 F) carbon steel procedures using between 45 KJ/in and 55 KJ/inch, which is more typical of the actual heat inputs expected in the field when using 5/32" diameter electrodes.

I have been directing qualification of low temp (-50F) procedures since 1974.

RE: heat input restriction

Good info weldstan, and a star for you, sir. With thanks.

And it is refreshing to see somebody recognize that ridiculously low heat inputs [<20KJ/inch] cannot be produced in the field with manual welding.

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