×
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

PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

(OP)
Dear All,

I am quite confused with the category for PTAW in ASME Section IX QW-257.1. I submitted the question to ASME to get an answer.

In the mean time, an ASME welding inspector insists that it is Spray Fuse because of Plasma Arc form as written in QW-216.3.

Does anyone have an answer for this?





RE: PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

This technique(PTAW) is a popular choice amongst valve manufacturers to deposit hard facing alloys on valve seats, e.g. Stellite deposition. Sec IX lists this under spray-fuse category. The definition is :spray‐fuse: a thermal spraying technique in which the deposit is reheated to fuse the particles and form a metallurgical
bond with the substrate.

PQR requirements are described under:QW-216 HARD-FACING WELD METAL OVERLAY, Clause QW-216.3 to be precise.
As regarding the list of variables , look under table QW-257.1, Heading:Hard‐Facing Spray Fuse(HFSF) (QW-216).

Hope it would help you.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

RE: PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

(OP)
Dear Pradip,

Thank you for your clarification. Then how is the fusing temperature and cooling rate measured/determined? Is is based on the melting temperature of the substrate and the fusing material?

RE: PTAW : Hard-Facing Overlay? or Hard-Facing Spray Fuse?

(OP)
We received confirmation from the ASME Inspector that PTAW(or PTA) is determined HFO not HFSF.

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