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Welders at work, c. 1939. A welder is a person or equipment that fuses materials together. The term welder refers to the operator, the machine is referred to as the welding power supply. The materials to be joined can be metals (such as steel, aluminum, brass, stainless steel etc.) or varieties of plastic or polymer.
• Welding Coordination Certification has existed since 1998, was adopted by IIW in 2007 and is currently recognised worldwide, allowing Welding Coordinators to be certified according to the requirement of ISO 14731. [11] • Plastic Welders Certification has existed since 2004, providing training and certification according to EN 13067. [12]
Railroad welding AWS D15.2: Railroad welding practice supplement AWS D16.1: Robotic arc welding safety AWS D16.2: Robotic arc welding system installation AWS D16.3: Robotic arc welding risk assessment AWS D16.4: Robotic arc welder operator qualification AWS D17.1: Aerospace fusion welding AWS D17.2: Aerospace resistance welding AWS D17.3
Arc welding power supplies can deliver either direct (DC) or alternating (AC) current to the work, while consumable or non-consumable electrodes are used. The welding area is usually protected by some type of shielding gas (e.g. an inert gas), vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated.
There are 3 major CSA Standards to which welders may be qualified: CSA W47.1 [4] for steels (including stainless steels), CSA W47.2 [5] for aluminum, and CSA W186 [6] for reinforcing bars. Under these CSA standards, welder qualification testing is carried out every 2 years by the Canadian Welding Bureau to ensure ongoing competence.
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