Welder

A welder is a tradesperson who fuses materials, typically metals, or thermoplastics, by welding. Welders join parts, build structures, repair equipment, and fabricate components in industries such as construction, manufacturing, shipbuilding, and automotive.

The term welder can also refer to a welding machine or power supply that provides the heat and current for welding.

Common welding processes include shielded metal arc welding (SMAW or stick), metal inert gas welding (MIG or GMAW), tungsten inert gas welding (TIG or GTAW), flux-cored arc welding (FCAW), and submerged arc welding (SAW). Some processes such as resistance welding are used in automation.

Welders prepare joints, select electrodes or filler metals, and control heat, speed, and travel angle to produce sound welds. They may weld, cut, grind, and inspect welds, following blueprints and codes.

Protective equipment is essential, including a welding helmet with appropriate shade, flame-resistant clothing, gloves, ventilation, and fire suppression.

Training and certification practices vary by country. In many places, entry requires an apprenticeship or vocational program, and professional certification from organizations such as the American Welding Society (AWS) in the United States or equivalent bodies elsewhere.

Welding quality is assessed by visual inspection and non-destructive tests; welds are evaluated for penetration, undercut, porosity, alignment, and defect sizes.

Working conditions can be hazardous, with heat, ultraviolet radiation, fumes, electric shock, and heavy equipment; safety programs and regulatory compliance are central to the craft.

The field continues to evolve with advances in welding automation, robotics, high-strength steels, and additive manufacturing.