Welding isn’t the only way to assemble piping. Sometimes contractors thread pipe together and sometimes they use flanges. Flanges appear to be simple to assemble—and they are—but when you don’t want them to leak, certain practices need to be followed. Those practices are addressed in ASME standard PCC-1, Guidelines for Pressure Boundary Bolted Joint Assembly.
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.
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 the root of the weld, with inert gas backing, with backing flux and with flux-coated wire.
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 welding?
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 use should be limited.
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?
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 WPSs and AWS Standard Welding Procedures differ in both application and adoption.
WebLEM is considered the industry’s most reliable, authoritative source for comprehensive labor units for typical project tasks. This web-based product contains the detailed labor data contractors have come to depend on.
With the WebLEM, you can quickly search for and retrieve information. Data in the WebLEM is reviewed and updated periodically to reflect the latest products and joining methods. You will need your MCAA.org username and password to log in to WebLEM. For WebLEM access questions, please refer to the WebLEM Access FAQs page.
