Unacceptable – Re bar cutting with gas, Acceptable – Re bar welding with gas?

charlotte construction staffing

I expect it's about how much heat is applied in the two processes, welding is likely to take less heat as you only need to melt the surface not all the way throught.

If you heat steel slowly to a high temperature and let it cool slowly it will temper and hence soften.

charlotte construction staffing

The above answer essentially is correct.

The high temperatures involved change the strength and hardness of the material. Mechanical strength falls due to tempering effect of welding. It also makes the steel more brittle.

This is acceptable in the ends of rebar, but not in the middle. A weakness in the middle can cause failure by buckling or bending.

Therefore, cutting is allowed but not welding. Hope this helps.