Prequalified Welds
Prequalified Welds
(OP)
Can anybody tell me what the significance of a prequalified weld is and how to determine what a prequalified weld is.
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RE: Prequalified Welds
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: Prequalified Welds
RE: Prequalified Welds
Joe Tank
RE: Prequalified Welds
RE: Prequalified Welds
Not all welding standard or codes accept the concept of prequalified welding procedures and they require the contractor to weld a sample that is subjected to various tests to prove the mechanical properties and soundness requirements of the appropriate standard are met.
The specific requirements or conditions that have to be met to be prequalified are dependent on the specific welding standard or code being used. For instance, AWS D1.1 lists the welding processes, base metals, filler metal requirements, joint details, fabrication requirements, inspection requirements, and acceptance criteria that must be met in order to be a prequalified welding process. If any of the conditions are not met, the procedure is not deemed prequalified.
Not all AWS welding codes have prequalified welding procedures. For instance, the aluminum welding code does not have prequalified welding procedures. So, the fabricator must qualify the welding procedures by testing them. The cost of qualifying a WPS can be considerable by the time one considers the cost of lost production, labor, machining, testing, etc.
However, the lessons learned can be well worth the time, effort, and cost involved.
Best regards - Al
RE: Prequalified Welds
RE: Prequalified Welds