Carbon in the form of blocks, rods and carbon compositions, or paste, have been used to support the workpiece in welding operations. Carbon sheets or blocks are available in various sizes, and can be shaped as needed.

In a joining operation, the parts to be welded may be small and must be jointed at such an angle that much time and patience is required to fit up the parts before the actual welding can begin. Often, just as the welding torch is applied, the parts which have been balanced very sensitively are blown apart, and they are much too hot to pick up and re-position without first

allowing them to cool. This sequence may occur three or four times before the welder is  successful in fusing the two parts.

This type of job can be simplified by imbedding the ends of the parts to be joined in carbon paste to maintain alignment. Just two daubs of carbon paste on top of a fire brick are adequate to hold most parts in the correct position. The welding can then be done in a minute or two, thus saving much time and frustration. See BACKUP BARS AND PLATES.

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