Why Hot Wire TIG?
When selecting a new joining, cladding or overlay process, TIG welding produces higher quality results when compared with other welding processes. TIG is a dynamic welding process that provides simple control of heat input and deposition rate which results in high quality weld integrity, grain structure, and finish. When making a welding process selection, deposition rate is an important factor. The typical limit for standard cold-wire TIG is 2 lb/hr ( 1 kg/hr), while GMAW/FCAW rates can be as high as 8 lb/hr (3,5 kg/hr). There are other processes with even higher deposition rates, but in all cases there are compromises in the welded metallurgy. Historically, the discussion began and ended with deposition rates; but now, many new applications require the higher quality welds provided by TIG and with the advent of hot wire TIG, combined with AMI’s Model 501 Hot Wire Power Supply, the desired high deposition rates can be achieved without compromising weld quality.
The AMI Model 501 Hot Wire Power Supply was developed specifically to address customer requests for higher deposition rates. It connects to the AMI Model 415 Power Supply and is controlled by it for coordinated operation. The unit delivers a maximum 200 amperes of AC current, at constant voltage, to eliminate arc steering in ferromagnetic materials. The current is controlled by phase-fired SCR’s, and the output voltage and current values are both fed back to the system based on calculated true RMS. The front panel displays also reflect the true RMS values, so you can easily calculate the power traveling into the wire.