Resistance welding refers to a group of welding processes called spot, seam, and projection, which are used to bond two or more metal surfaces by electric current and mechanical pressure. Weld electrodes conduct the electric current to the two pieces of metal as they are forged together under heat and pressure. These welding techniques are applied in various technologies including cars, trucks, trains, cranes, bridges, roller coasters, aerospace, medical instruments, and nuclear equipment.
ANSI/AWS C1.4M/C1.4-2009, Specification for Resistance Welding of Carbon and Low-Alloy Steels, is a new standard from the American Welding Society (AWS) that establishes welding equipment requirements and welding procedures for coated and uncoated carbon and low-alloy steels, including mild steels and high strength low-alloy (HSLA) steels. This American National Standard also provides specifications for the shear strength and weld button diameter requirements for carbon steel and low-alloy steel sheet resistance and projection welds.
AWS, an ANSI organizational member and accredited standards developer, is a nonprofit organization working to advance the science, technology, and application of welding and allied joining and cutting processes including brazing, soldering, thermal spraying, ceramics, lamination, and robotics. AWS membership includes engineers, scientists, educators, researchers, welders, inspectors, welding foremen, business executives and sales associates.