Buying welding cable from fabrication bays and maintenance cribs.

A welding cable of a given size holds many more, much finer strands than a building wire of the same gauge. That is what lets it flex repeatedly without work-hardening at a connector, and it is also what makes jacket damage more serious, since fine strands corrode quickly once moisture reaches them.

Flexibility is not a vague quality in a buyer's mind. It is tested by taking a coil and bending it through the radius it would see on a job. Cable that cracks or feels stiff has aged, whatever the print says, and it is described that way rather than by its gauge alone.

Fabrication bays, automotive plants and maintenance departments are the main sources in the Metroplex. A fabricator that re-lays a welding bay leaves coils of 1/0 and 2/0 behind, and a plant changeover leaves the longer runs that fed a fixture line, cut at both ends when the line moved.

Maintenance cribs produce the odd lots: a coil of 4/0 bought for a single repair, a length of 2/0 kept as a spare, and a box of short leads that have been re-terminated so often the ends are more tape than cable. Those lots are small and they are worth listing together.

One photograph of the whole coil and one of the worst damaged sections is enough to start. The coil diameter shows the buyer how much cable is there.

A welding jacket takes abuse that building wire never sees. It is dragged across concrete, run over by a cart and laid against hot plate, so cuts, gouges and flat spots are normal, and a buyer looks at how deep they go rather than counting how many there are.

Cut ends matter more here than in most families. A lead cut and left open wicks water into fine strands, and the corrosion travels further than the visible damage suggests. Ends that were taped or sealed are noted, because they say something about how the rest of the cable was treated.

A welding cable lot is reviewed on what it can still do. Cable that stays flexible can go back into service as a lead; cable that has stiffened goes into a different review entirely, still copper and still heavy, but no longer the same material to a buyer.

That is why a long lead should not be cut down to remove a bad end without thought. A thirty-foot lead with three damaged feet is worth more with the damage described than as a twenty-seven-foot piece, because the buyer decides what to do with it. Portable cord sits close by on the same shelf and is handled under its own file.