| 摘要 |
Thin metal parts such as one eighth inch or less cast iron or one quarter inch or less cast aluminum are repaired by drilling a series of overlapping holes extending generally perpendicular to the crack at each end of the crack and at spaced locations along the crack. A lock of the general outline of the series of overlapping holes is fixedly secured in each of the series of overlapping holes. At least one hole having a diameter no greater than 0.200 inches is drilled in the crack between the locks so that the hole overlaps a portion of one of the locks. The hole is tapped with a tap having at least 27 threads per inch and a plug having the same number of threads per inch as the tapped hole is secured in the tapped hole thereby pre-stressing the locks and filling the gap of the crack. The plug is torqued until the torquing force exceeds the strength of the plug thereby snapping off a portion of the plug which extends beyond the surface of the part. Additional holes are drilled, tapped and plugged along the crack to completely fill the gap of the crack. Preferably, the tapped holes and plugs are tapered, the tapered plug having a maximum diameter of about 0.205 inches and a minimum diameter of about 0.155 inches, and the tapped hole and plug having 32 threads per inch.
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