Standard: WRC BUL 131


This standard is available for individual purchase.

or unlock this standard with a subscription to IHS Standards Expert

IHS Standards Expert subscription, simplifies and expedites the process for finding and managing standards by giving you access to standards from over 370 standards developing organizations (SDOs).

  • Maximize product development and R&D with direct access to over 1.6 million standards
  • Discover new markets: Identify unmet needs and discover next-generation technologies
  • Improve quality by leveraging consistent standards to meet customer and market requirements
  • Minimize risk: Mitigate liability and better understand compliance regulations
  • Boost efficiency: Speed up research, capture and reuse expertise
For additional product information, visit the IHS Standards Expert page.

For more information or a custom quote, visit the IHS Contact Us page for regional contact information.

A plasma is a gas which has been heated to a condition where it is at least partially ionized and is, therefore, capable of conducting electric current. When an arc is established through the gaseous column separating two electrodes, some of the gas molecules in the column become ionized. The ionized zone, or plasma stream, consists of positively charged atoms of the arc gas, an essentially equal number of electrons, and neutral atoms or molecules. The electrical conductivity of a plasma stream varies with the degree of ionization but for argon plasma it is about 0.05% that of copper. More comprehensive discussions of plasma physics may be found in the literature. A plasma exists during any arc occurrence. In nature, the air that is ionized by a lightning bolt constitutes a plasma. The same ionization phenomenon occurs in welding arcs, carbon arc lights and arc furnaces. In recent years, however, the expression "plasma arc" has become associated with those processes employing a constricted arc. Arc constriction is brought about by forcing the arc to pass through a small nozzle or opening as it passes from the electrode to the workpiece.

Organization: Welding Research Council
Document Number: wrc bul 131
Publish Date: 1968-07-01
Page Count: 37
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active