Category: Pipe Welding
-
NCPWB Technical Bulletin: Microbiologically Influenced Corrosion (MIC)
What is Microbiologically Influenced Corrosion (MIC) and why do contractors need to know anything about it? Well, it turns out that MIC can negatively affect your profits.
-
NCPWB Technical Bulletin: Purge to Protect Stainless-Steel Pipe Welds
On occasion we get questions from our members who would like to use backing flux in lieu of purging when making welds on stainless steel or other corrosion resistant materials. This bulletin describes an experiment conducted by NCPWB Consultant Walter Sperko where he had a colleague make stainless steel butt welds without any protection of…
-
NCPWB Technical Bulletin: A Welder Qualification Record Says “Backing: With or Without.” What Does That Mean?
When reviewing a Welding Procedure Specification (WPS) or a welder qualification record, the term “backing” frequently appears. In some cases, backing is required, while in others, it is optional. Backing can take various forms, including metal, non-fusing metal, nonmetallic materials, or even weld metal. But what exactly is “backing,” and why is it important in…
-
NCPWB Technical Bulletin: When To Use E6010 Welding Electrodes
The E6010 electrode is a wire encased in cellulose held together with salts and minerals. These electrodes penetrate better than low-hydrogen electrodes like E7018 when making root passes, making it easier to make a good root pass. However, E6010 introduces hydrogen into the weld creating a risk of cracking, and this article shows when its…
-
NCPWB Technical Bulletin: What Mechanical Contractor Managers Need to Know About Piping Codes and Customer Specifications
Piping codes are standard industry practice, and failure to agree on the one that applies to your work can result in ugly disputes with customers. Customer specifications can have inspection requirements that can result in repairs to welds that you did not plan for. Welders can make welds that put your business at risk. This…
-
NCPWB Technical Bulletin: What You Should Understand About GMAW (MIG) & FCAW Welding
While there is a lot of buzz about modern waveform controlled power sources and how they make it easier for a welder to make the root pass, the basics of MIG welding have not changed. This article describes the technical aspects of GMAW, explains how the metal gets from the wire to the workpiece (transfer…
-
NCPWB Technical Bulletin: The 37-1/2 Bevel
The 37-1/2°± 2-1/2° bevel is the normal bevel angle to find on piping fittings and flanges and in many specifications and standards. Where did such a weird angle originate?
-
NCPWB Technical Bulletin: The Difference Between NCPWB WPSs and AWS Standard Welding Procedures
This bulletin explains how the National Certified Pipe Welding Bureau (NCPWB) Welding Procedure Specifications (WPSs) differ from the American Welding Society (AWS) Standard Welding Procedures in both application and adoption.
-
NCPWB Technical Bulletin: Qualification of Welding Operators for Orbital TIG Welding
There is occasional confusion among NCPWB members who use orbital pipe and tube welding machines when it comes to determining just what is required to qualify a welding operator and how to properly complete the QW-484 form for welding operators. This bulletin clarifies the difference between a welder and a welding operator and provides sample welder qualification…
-
NCPWB Technical Bulletin: Welding Fumes
This bulletin explains how to protect welders from exposure to welding fumes and minimize health risks.