Automatic gas detector for arc welder
AssigneeAmoco Corporation
InventorsBruce W. Weber, Caroll E. Gustafson, James A. Bice
Life of this patent
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Abstract
An automatic gas detector is provided for a welding machine. The automatic gas detector is safe, efficient and effective and particularly useful in oil refineries and petrochemical plants. The automatic gas detector includes a gas monitor for detecting combustible gases, a circuit interrupter connected in a power supply circuit between a power source and the welding machine, and a circuit connected to the gas monitor and the circuit interrupter to de-energize the power source when the gas monitor senses a dangerous level of combustible gas.
Claims9
An automatic gas detector for an arc welder, comprising:
- means for detecting combustible gases, circuit interrupting means connected in a power supply circuit between a power source and an arc welder, and
- means coupled between said gas detection means on said circuit interrupting means for causing said circuit interrupting means to be operated to interrupt the power supply circuit between the power source and the arc welder when the gas detecting means senses a dangerous level of combustible gas.
A welding safety system, comprising:
- a welding machine;
- a power source for supplying power to said welding machine;
- a gas sensor for detecting the concentration and level of combustible gases;
- an interrupting circuit operatively connected to said power source and said arc welding machine;
- and
- a decoupling circuit operatively associated with said gas sensor for activating said interrupting circuit and shutting off said supply of power to said welding machines when said gas sensor detects a dangerous concentration and level of combustible gases.
An arc welder and gas detector assembly comprising:
- an alternating current power supply;
- an arc welder;
- a control coil;
- a contactor having normally open contacts connected to said power supply and to circuitry of said arc welder to selectively supply alternating current to said arc welder when said control coil mechanically coupled to said contactor is energized;
- a combustible gas detector mounted up wind of said arc welder, said gas detector providing a gas signal when combustible gas is detected;
- an interrupter circuit connected to said gas detector and said contactor, said interrupter circuit including a normally closed interrupter contact which is connected in series with said control coil of said contactor, said interrupter circuit, on receipt of said gas signal, causing said interrupter contact to open and interrupt the supply of power to said arc welder.
Dependencies are inferred from the claim text.