The mandrel of the pipe bender often breaks.

Some problems mentioned by the landlord, such as material, pipe thickness, mandrel design, pipe bender itself, pipe size. Generally speaking, the mandrel with poor material is easy to break and explode. If the pipe thickness is relatively thick, the mandrel will burst or get stuck when bending, and the mandrel will break when pulling the callback device. Many people don't know that the mold of every pipe bender is patented. So each manufacturer's mandrel and machine are different. Powerful manufacturers will not have the problems you said, and only inexperienced ones will have the situations you said. The pipe sizes produced in China are different, so it is also possible that the mandrel is stuck and broken due to the size of the pipe. I hope you can be satisfied with my answer!