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Ergonomics 6
1. Ergonomics in Welding An overview of WMSDs* hazardous exposures and solutions *Work-related musculoskeletal disorders
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6. WA State-funded compensable claims 1994-2004 Welders, Cutters, Solderers By Nature of Injury Sprains account for more than 1/3 of the compensable claims among welders in the State of Washington. Some of those could be caused by hazardous WMSD exposures.
7. WA State-funded compensable claims 1994-2004 Welders, Cutters, Solderers By Body Part The back, neck and shoulder together with the arm and hand regions make up more than one half of the injuries among welders in Washington State. Preventive efforts should therefore focus on those body parts among welders at your workplace. Welding is a strenuous occupation involving work in awkward postures and handling heavy equipment, usually with a high degree of sustained stress to arm and shoulders.
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11. Common postures adopted in welding Working in front Working at ground level Working above the shoulders Working at ground level, precision work Working at ground level, confined space Working above shoulders, confined space ‡ From: Torner et al, 1991
12. Awkward postures in welding Torso twisting Severe torso flexion Kneeling, squatting Bent wrists Neck flexion/extension Shoulder flexion/abduction (separation)
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17. Ergonomic improvements Team lifting helps reduce heavy, awkward lifting of equipment and materials. AFTER From: SIMA San Diego Ergonomics Program BEFORE
18. Ergonomic improvements To reduce working with the back bent at ground level, any work table will help to adopt a safer posture AFTER From: Shipyard Ergonomics, 2003 BEFORE
19. Ergonomic improvements Pre-assembly and material handling equipment helps reduce unnecessary lifting or any other kind of manual material handling
20. Ergonomic improvements This rotational clamp for pipe helps reduce awkward postures for the neck, shoulders and arms.
21. Ergonomic improvements Tables for welding and transport reduce manual lifting, carrying of heavy materials. The tables also have wheels.
22. Ergonomic improvements Welding leads on pulleys help reduce heavy and awkward lifting, static postures for long periods.
23. Ergonomic improvements Robotic automation, are also feasible solutions to highly repetitive motions with the arms and hands. May also reduce the exposure to fumes.
Hazard: Manual wire welding is a primary element in ship construction and repair. The use of standard straight welding "whips" forces the worker to flex the wrist towards the little finger side. Carpal Tunnel Syndrome may also be associated with the use of straight welding whips. Solution: A bent-tip wire-welding handle (see photo) allows the worker to maintain a more natural or neutral wrist posture than straight "whips." In this manner, the tool, not the wrist is bent.
Most think of workplace injuries as those that are immediate and have a visible, physical effect (e.g. broken bone, cut) and the causes are tangible, concrete (e.g. slip, hit by object) But injuries can develop over time and not be a result of a single incident. The effects are less visible (tingling, numbness, swelling) which can become more disruptive (pain, loss of function, loss of range of motion).
Most think of workplace injuries as those that are immediate and have a visible, physical effect (e.g. broken bone, cut) and the causes are tangible, concrete (e.g. slip, hit by object) But injuries can develop over time and not be a result of a single incident. The effects are less visible (tingling, numbness, swelling) which can become more disruptive (pain, loss of function, loss of range of motion).