| 摘要 |
A method for joining together a plurality of tubes to form a frame, such as a bicycle frame, includes providing a plurality of projections upon an end portion of a tube for effecting a projection weld with each projection. The tube end portion complements or corresponds to the contour of the surface of a tube to which it is joined so that when the tubes are contacted with one another only the projections make contact thereby leaving a gap of uniform width between the pipes. After tacking the pipes together with projection welds, the gap around each joint is filled with brazing solder.
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