×
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

The big difference interpass temperature beetween Root pass and Fill Pass

The big difference interpass temperature beetween Root pass and Fill Pass

The big difference interpass temperature beetween Root pass and Fill Pass

(OP)
when we qualify PQR, we will record all the value of interpass in all pass (Root, Hot, Fill, Cap). We will choose the biggest value among all the value (called A) According to ASME IX, in WPS we will add more 56 degree to this biggest value of interpass, so Maximun interpass temperature in WPS is A + 56. This value of interpass will be used in all pass in WPS (Root, hot, fill, cap).

There is one thing I'm not clear : For example, in root pass while qualify PQR,I have interpass temperature 80 degree. Fill pass I hvae interpass 200 degree. So WPS will have interpass 200+56 = 256 degree for all pass. In production weld, my welder performs Root pass with interpass 250 degree. It far over 80 degree in comparision with qualify PQR but is still in the range of WPS. So the quality of root pass is affected or not. There is something unreasonable here or not.

The big difference interpass temperature beetween Root pass and Fill Pass affects the quality of weld joint or not?

RE: The big difference interpass temperature beetween Root pass and Fill Pass

There is nothing wrong with what you have stated regarding the production welding. The welder is within the maximum interpass temp requirement of 256 deg C. Interpass temperature is more of a concern with impact qualification and with corrosion properties (austenitic stainless and duplex stainless base materials).

RE: The big difference interpass temperature beetween Root pass and Fill Pass

The maximum interpass temp measured during qualification + 100 F (55 C) allowable per QW-406.3 is only applicable for where impact testing is required. For temper bead welding the root pass not a temper bead) is excluded from the requirement per QW-406.8, which again is applicable only when impact testing is a requirement.

If the production weld does not require impact testing, you need not be concerned.

Finally, the interpass temperature does not apply to the root bead per the definition of interpass temperature in ASME IX and the definition of "Pass: a single progression of welding or surfacing operation along a joint, weld deposit or substrate. The result of a pass is a weld bead or layer."

RE: The big difference interpass temperature beetween Root pass and Fill Pass

Well, considering that a root pass is deposited as molten metal and plasma across a gap where there is no previous metal, the root pass temperature is just a few shades closer to 2500 degrees rather than 250 degrees. Once the root is deposited and has cooled to solid metal, then the following passes may need to consider inner temperatures. 8<)

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