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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.
For example, the factor of welding position influences weld quality, that welding codes & specifications may require testing—both welding procedures and welders—using specified welding positions: 1G (flat), 2G (horizontal), 3G (vertical), 4G (overhead), 5G (horizontal fixed pipe), or 6G (inclined fixed pipe).
Welder certification is based on specially designed tests to determine a welder's skill and ability to deposit sound weld metal. The main part of the welder's test consists of welding one or more test coupons which are then examined using non-destructive and destructive methods. The extent of certification is described by a number of variables ...
Diver-welders for hyperbaric wet welding ISO 15618-2: Qualification testing of welders for under-water welding. Diver-welders and welding operators for hyperbaric dry welding ISO 17635: Non-destructive testing of welds. General rules for metallic materials ISO 17660-1: Welding - Welding of reinforcing steel - Part 1: Load-bearing welded joints ...
The main tool of the ornamental ironworker is an arc welder. Welding and burning equipment are considered "tools of the trade.” Welding and burning equipment are considered "tools of the trade.” However, any ironworker must be certified to weld on a project.
Upon successful completion of required testing in blueprints, hydraulics, pneumatics, rigging, pipefitting, welding, burning, gears, couplings, and other various types of mechanical fasteners and machinery, as well as mobile equipment and other heavy machinery. A typical millwright serves a 4- year apprenticeship before becoming a journeyman.
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