Help putting timer on my welder

[Gunit]

Hi Guys,

Im looking at adding a delay timer to my mig welder, ( new welders come with this) I need it to be adjustable in sec, on for 1-10 sec and off for 1-2 sec, I would like it to work with the trigger on my welder. I see all kind of delay timers on ebay but not sure witch one would work, I would like one with dials just for easy adjustability but not necessary . I would put a switch in between the timer so i could have the welder in normal mode and switch it to stitch welding (timer mode) .The welder is 220v but if i cant fined a timer that works with 220v i can just run a different power supply for the timer.

Thanks for your time and help.

G

 

[KMoffett]

What's the purpose of those long time intervals on a MIG?

Ken

 

[Gunit]

Stitch welding, yes you can do it with the trigger, but with a timer you get the same size bead each time.

 

[kellys_eye]

There are a myriad of such devices in eBay - something like this for one:

https://www.ebay.co.uk/itm/ADJUSTAB...822689?hash=item3f27fcdce1:g:DJYAAOSw4A5Yr3IA

Change the preset resistors (time-setting) for full size potentiometers and panel mount them.

You might need a wall wart to power it but .... meh.

 

[Gunit]

I will look at the one, Thanks for your time and help!
G

 

[Bluejets]

The trigger switch more than likely operates currently on a low voltage so might be a good idea to find out what that is.
Reason being it may be a factor in deciding what voltage timer unit to buy.
One referred to above is 12v but there may also be others available e.g. 5v or 24v.

Not a bad idea though as a mod for your welder.
Just wondering about burn back times and whether this would be affected by the mod.

 

[Gunit]

I will test that switch and see what i have. The welder that i used that had this option was awesome with no burn back. Thanks for your help!
G

 

[KMoffett]

Gunit,

What make/model MIG are you wanting to add the timer to. Sometimes there are block schematics for "major" brand machines. I read about "Spot" and "Stich" settings on MIGs. I'm curious because I made a pulser for a Miller TIG. It actually switches between high and low current pulses, as opposed to ON/OFF.

Ken

 

[Gunit]

Hey Ken, its a older one. Thanks for time and help.

 

[KMoffett]

Gunit,

Google is my friend: https://www.hobartwelders.com/om/6digit/o194430a_hob.pdf
Schematic on page 25. Trigger switch connections are at bottom center. Probably low DC voltage.

Ken

 

[Gunit]

Hey Ken, I have the pdf , but thanks, yes cant be much current with the 14-16 ga wire that goes to the trigger, I just need a relay setup that will turn on and off that i will hook to the trigger wire, I just was not sure what relay would do it,( kellys_eye ) pointed me to one, its just in the UK need to find something in the US.
Thanks for your help.
G

 

[KMoffett]

Gunit,
How handy are you at desoldering and replacing a couple of capacitors? For your short on/off periods ,the timer Kellys-eye recommended timer would be at the very end of their ranges. If you can replace a couple of capacitors the timer ranges could be shortened considerably. Here is another one with the same issue, but in the USA.:
https://www.electronickits.com/adjustable-cyclic-timer-assembled/

Ken

 

[Gunit]

No problem on soldering, if you can tell me witch ones.
Thanks for all your help!
Gary

 

[Gunit]

This is the one i was first looking at before i asked for help, dont know if it is even right.
https://www.ebay.com/itm/DC-12V-Del...fff91382|iid:1&_trksid=p2481888.c100678.m3607

 

[KMoffett]

Gunit,

From the photo, there two black, cylindrical ,electrolytic capacitors that are likely the timing capacitors. Replacing them with ones of less capacitance should proportionally reduce the timer ranges.


Ken

 

[KMoffett]

I looked at that timer too. If its time ranges are OK with you, that should work too.

Ken