French state-controlled utility Electricite de France (EdF) previously notified the country's nuclear safety authority, ASN, of deviations in the manufacture of some steam-generator welds for its nuclear reactors. The "deviation from technical standards" involved the “detensioning heat treatment on the welds” (stress relief).
As a metallurgist, I am frequently asked for assistance on metallurgical issues relating to alloy products and selection. Here are the most frequently asked questions and a guide to answering these questions.
International heat-treatment codes and standards require welders to conform to heating parameters for the target workpiece, including heat-up time, temperature uniformity, soak time and cool-down time.
Air Liquide and its U.S. subsidiary, Airgas, opened the Advanced Fabrication Center (AFC) at the Air Liquide Delaware Innovation Campus in Newark, Del. The AFC focuses on helping industrial customers adopt new manufacturing technologies and more efficient and cost-effective production processes. It will deliver a continuous flow of development projects, innovations and exploratory R&D. Air Liquide’s manufacturing expertise in welding gases and advanced fabrication processes will be on display at the center.
Sciaky Inc., a subsidiary of Phillips Service Industries Inc., received an order from a southeast Asian aerospace parts manufacturer for a dual-purpose electron-beam additive-manufacturing (EBAM) and EB welding system. The hybrid machine will be customized with special controls to switch from 3D printing to welding in a quick and easy process. The company will utilize the system to 3D print metal structures and to weld dissimilar materials and refractory alloys for these structures and other aerospace parts.
Pyro-Paint 634-SIC is an advanced silicon-carbide-filled, water-based coating that significantly reduces the oxidation of most commercial grades of graphite and carbon used in metallurgical applications up to 2550°F (1400°C).
Check out the October 2019 issue of Industrial Heating, featuring the "High-Temperature Refractory Maintenance", "How to Tell if You Really Have an Abrasion Problem", "Direct-Fired Gas Burners for High-Temperature Applications", and much more.