Hi,
Haven’t previously posted on here but have modified my SIP 130 with the roller support, metal liner and the feed motor modifications described by baz-r back in February 2010. Not done that much welding since but will be in the very near future as I need to replace about 15% of the bodywork of my Fiat Dino Coupe (my new restoration project). I am looking to semi-automate the butt welding process by adding an adjustable timer to the motor feed and fitting a gas valve. I looked at providing pre and post flow to the shielding gas but as I’m unlikely to be welding alloy any time soon, I figured this wasn’t essential at his time (or may be it is - advice please). So far, the delay timers that I have seen use a momentary voltage to trigger the delay. I was think of providing the momentary voltage be doing this –
From what I have read, the capacitor will allow the coil of the relay to be energized until the capacitor stores a charge, which then de-energizing the coil. The resistor will bleed off the charge of the capacitor when positive voltage is removed from the other side of the coil, effectively resetting the momentary output.
The idea is that the torch trigger provides the switched voltage for the above circuit and for the operation of a relay to open the gas valve. The momentary output initiates the delay circuit for the motor which then gives an adjustable on time. Release the torch trigger, the gas valve closes and the timer resets. I would also fit a bypass switch for the motor delay for when I’m not stitch/spot welding.
Does this sound like a good idea? Any thoughts would be appreciated.
JD5758
Haven’t previously posted on here but have modified my SIP 130 with the roller support, metal liner and the feed motor modifications described by baz-r back in February 2010. Not done that much welding since but will be in the very near future as I need to replace about 15% of the bodywork of my Fiat Dino Coupe (my new restoration project). I am looking to semi-automate the butt welding process by adding an adjustable timer to the motor feed and fitting a gas valve. I looked at providing pre and post flow to the shielding gas but as I’m unlikely to be welding alloy any time soon, I figured this wasn’t essential at his time (or may be it is - advice please). So far, the delay timers that I have seen use a momentary voltage to trigger the delay. I was think of providing the momentary voltage be doing this –
From what I have read, the capacitor will allow the coil of the relay to be energized until the capacitor stores a charge, which then de-energizing the coil. The resistor will bleed off the charge of the capacitor when positive voltage is removed from the other side of the coil, effectively resetting the momentary output.
The idea is that the torch trigger provides the switched voltage for the above circuit and for the operation of a relay to open the gas valve. The momentary output initiates the delay circuit for the motor which then gives an adjustable on time. Release the torch trigger, the gas valve closes and the timer resets. I would also fit a bypass switch for the motor delay for when I’m not stitch/spot welding.
Does this sound like a good idea? Any thoughts would be appreciated.
JD5758