Welding guns are hand tools, but they add heat and must be held in stiff positions for longer periods of time than most other hand tools. Welding guns should be fitted to the job and the welder. Many cumulative trauma disorders can be attributed to poor tool design and poor training. Some of the factors that contribute to cumulative trauma disorders in welding are: 1. Handle design; 2. Weight; 3. Cable strain relief; 4. Trigger and trigger location; 5. Welder training. In the use of hand tools, one important consideration is the static loading of the shoulder, forearm, hand and finger muscles. Static muscle loading varies with the weight of the tool and the orientation in which it is held. Static muscle loading also varies with the rotational torque required to maneuver the, welding gun.
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