Patent ID: 11911856
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A mobile hardbanding unit for applying a wear-resistant metal band to a drill string section, the unit comprising:
a mobile platform;
a weld box supported on the platform comprising an opening for receiving a drill string section;
a PTA torch supportable in the weld box;
an electrical power source electrically connected to the PTA torch;
electrical conduits connecting the power source to the PTA torch;
a PTA powder feed assembly comprising:
a PTA powder container connectable to a supply of PTA powder gas;
a PTA conduit for conducting gas-entrained PTA powder to the PTA torch; and
an adjustable feeder for metering the supply of gas-entrained PTA powder to the PTA conduit;

a conduit configured to connect a center gas supply to the PTA torch;
a conduit configured to connect a shield gas supply to the PTA torch;
a cooling system comprising:
a chiller; and
a conduit for circulating a chilled fluid between the chiller and the PTA torch and the electrical conduits connecting the power source to the PTA torch;

a pipe management assembly;
a control system;
a non-PTA arc welding torch supportable in the weld box;
electrical conduits connecting the electrical power source to the non-PTA torch;
a hard metal feed assembly comprising an adjustable feeder for metering the supply of hard metal to the non-PTA torch;
a conduit configured to connect a shield gas supply to the non-PTA torch; and
a polarity switch interposed in the electrical conduits connecting the electrical power source to the non-PTA torch and the electrical conduits connecting the electrical power source to the PTA torch.