Thermal torch lead gas delivery methods and related systems and devices

摘要

In some aspects, methods of initiating a plasma arc in a plasma cutting system can include providing a plasma gas supply lead line extending between a power supply and a plasma arc cutting torch, where the lead line has a first segment proximate to the power supply and a second segment proximate to the torch, and an in-line valve within the lead line between the first segment and the second segment; selectively closing the in-line valve to capture a static volume of gas in the first segment; establishing a decayable volume of gas in the second segment; and initiating the plasma arc when a pressure of the decayable volume reaches a pressure value within a predetermined range.

主权项

1. A method of initiating a plasma arc in a plasma cutting system, the method comprising:
providing a plasma gas supply lead line extending between a power supply and a plasma arc cutting torch, the lead line comprising a first segment proximate to the power supply and a second segment proximate to the torch, and an in-line valve within the lead line between the first segment and the second segment; closing the in-line valve, by a controller, to capture a static volume of gas in the first segment; establishing a volume of gas in the second segment having a decaying pressure; and initiating the plasma arc when the decaying pressure of the volume of gas in the second segment reaches a pressure value within a predetermined range while the in-line valve remains closed.