| 摘要 |
Welding backup shoe apparatus, wherein plural backup shoes are carried side-by-side on flexible bands, each backup shoe being resiliently biased outwardly so that the backup shoes are resiliently pressed against the inner side of a weld joint between end-to-end pipe sections to prevent blowthrough of weld metal through the joint during welding and to dissipate heat from the weld metal. A pair of bands, each carrying a plurality of backup shoes, are supported by the shoes of a welding clamp, the bands being disposed at the upper and lower interior of the pipes to be expanded outwardly when the welding clamp shoes are expanded and to be retracted inwardly when the welding clamp shoes are retracted.
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