Re: ASTM B705 Inconel welded pipe - Manufacturing welding process

From: <John>
Date: Tue Feb 27 2007 - 07:34:00 EST

check B31.3 - 2004 creep weld strength reduction factor w... welds in high temperature usage even with a creep resistant base metal may lose strength due to the properties of the filler metal (lack of creep resistance). So from that standpoint you may be better off with no filler.

" What is the production welding process that does not require a filler
  metal. Why is such a welding process required?" Frictio ERW etc. there are various methods of joining metal without filler. They all are very automated and high tech in nature (The new Airbus uses friction and electron beam to join the aluminum panels together, no rivets = less weight)

"The supplier is offering the material that uses a filler material. From the
  text of the ASTM std. the requirement of not using a filler material is not   an optional one. Will the offered material qualify under the specification?" NOPE Find another supplier...

<a href="/group/PipingDesign/post?postID=-C42hT2QWRgh6a-_kLw1gRvu0ybHaill53u2pfhLVWbLXXgKUdV8juRBnl_CQ4g5rj8WPPhPXjAM">sviswan@technip.com</a> wrote:

  My net trawling did not yield an answer, that is why I am posting the   question here.

  The ASTM specification requires the subject pipe to be produced by an   automatic welding process that do not use a filler metal.   What is the production welding process that does not require a filler   metal. Why is such a welding process required?

  The supplier is offering the material that uses a filler material. From the   text of the ASTM std. the requirement of not using a filler material is not   an optional one. Will the offered material qualify under the specification?

  Sajit Viswan
  Piping materials engineer
  Technip Abu Dhabi

  Save a tree...please don't print this e-mail unless you really need to.

Best Regards,

John C. Luf
Cleveland Ohio U.S.A when I'm not in Austria

Member B31.3, Piping Engineer - Stress Analysis, Pipe Supports, Component Design, and Surge Analysis... according to my daughters master of unimportant trivia

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[Non-text portions of this message have been removed] Received on Tue Feb 27 07:34:00 2007