Bucking Bars Made of Tungsten Have Been Utilized for Some Riveting Tasks

Recently, bucking bars made of tungsten have been utilized for some riveting tasks at a localaircraft manufacturer, where subjective reports from the employees suggested less vibration was transmitted to the hands.

However, since the tungsten bars weigh approximately 2.3 times more than the steel bucking bars of the same size and shape, the company was reluctant to implement tungsten bucking bars on a full scale. While the increased mass of the tungsten bar may be an advantage as far as dampening the vibration, the effect on the hand grip exertion levels was unknown.

Therefore, the overall objective of this study was to perform a field evaluation to quantify and compare the vibration transmission and gripmuscle activity characteristics when using bucking bars of the same size and shape, but made of different materials.While controlling for rivet size, air hammer,skin material, and bucking bar shape, the tungsten bucking bars resulted in a decrease transmission of vibration, with no difference observed for grip muscle activity. Thus, when access (i.e., clearance for the bucking bar and hand) dictates that the size of the bucking bar be used that was investigated in this study, it appears that the use of a bucking bar made of tungsten, which will have a larger mass than the traditionally used steel bars, may be useful in reducing vibration transmission and positively affecting the health and safety of the employees.

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