Mig with Gas. See weld. Opinions. - Alfa Romeo Bulletin Board & Forums
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post #1 of 20 (permalink) Old 05-31-2019, 02:36 PM Thread Starter
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Mig with Gas. See weld. Opinions.

If you have any experience about welding.
See my weld, and tell me your opinion.
I believe, is there more speed than better result..? I don't know.
Tell me if you understand.
(my machine, Mig Telwin 180A, with gas).
Thank you.
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post #2 of 20 (permalink) Old 05-31-2019, 02:59 PM
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More power and thus more penetration required IMO
Pete

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post #3 of 20 (permalink) Old 06-01-2019, 11:04 AM
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Way to cold, turn up the amps to when it sounds like bacon frying. In U.S. we use 75% Argon 25% CO2 gas with a 70S-6 wire. What kind of gas are you using.
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post #4 of 20 (permalink) Old 06-02-2019, 12:46 AM Thread Starter
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Way to cold, turn up the amps to when it sounds like bacon frying. In U.S. we use 75% Argon 25% CO2 gas with a 70S-6 wire. What kind of gas are you using.
I think Gorgon..?! I am not sure... I will ask for ...

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post #5 of 20 (permalink) Old 06-02-2019, 12:54 AM Thread Starter
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More power and thus more penetration required IMO
Pete
...more power. I 'll try.

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post #6 of 20 (permalink) Old 06-02-2019, 01:43 AM
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Turn it up until if you pull the trigger for ~1 second you blow a hole in the metal. Then either turn it down slightly, or learn to pull the trigger for less than a second.

In thin sheet metal you weld by tacking, not running beads. Eventually your tacks join and the joint is welded.

If you weld like 3mm plus thick you can keep the trigger pulled and push a long seam weld and it should look like this ...🙂
Pete
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post #7 of 20 (permalink) Old 06-02-2019, 02:02 AM
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The "inside" of a sheet or panel steel welded via the tack method. This has not been ground, but potentially hammer and dollied on.

You can see how each tack penetrated fully.
Pete
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post #8 of 20 (permalink) Old 06-02-2019, 02:32 AM
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Got the Sheet Metal Fabrication book by Ed Barr the other day, looks like either wire speed and voltage too low as per figure on page 53.
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post #9 of 20 (permalink) Old 06-02-2019, 05:22 AM
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Hi mate your wire speed is a little too fast and your amps are too low. Just play around till you find the sweet spot. PSK has given you good advice.
By the way the sweet spot is different for different metal thicknesses.
Regards John.

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post #10 of 20 (permalink) Old 06-04-2019, 01:21 AM Thread Starter
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First of all, THANK YOU, for your answers !!
And YES. You have right!
I tried again, with more power, and just a bit lower wire speed.
Very-very Better !

(I weld for first time on the car. For that reason, I tried not to damage the sheet metal with holes.
I observed, that big problem, is 'Earthing'. Best connect with body, means best welding.
It depends from the earthing cable and the contact with body. And whole circuit, machine contact-cable-contact on body.
And if the body is under corosion, the resistance is too high, that means, topically you want more curent!
I think very important, perhaps the most important thing-problem, in this type of welding).

@and Metalart: the kind of gas is: 82% Argon and 18% CO2. and wire 0.6mm, (0.0236in).

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post #11 of 20 (permalink) Old 06-04-2019, 01:29 AM
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Make sure you disconnect the car's battery before welding with an electric welder.
Pete

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post #12 of 20 (permalink) Old 06-04-2019, 04:51 AM Thread Starter
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Quote:
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Make sure you disconnect the car's battery before welding with an electric welder.
Pete
Thank you for this info, Pete! But look this foto...
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post #13 of 20 (permalink) Old 06-04-2019, 09:26 AM
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One other word of advice. After completing what you think is a full run of beads, shine a flashlight on the welds (from the opposite side) and look for pin holes.....you will most assuredly have a lot of them. You will need to go over those areas next. This is best done at night time with the lights turned off.


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post #14 of 20 (permalink) Old 06-04-2019, 11:00 AM Thread Starter
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... shine a flashlight on the welds (from the opposite side) and look for pin holes..... This is best done at night time with the lights turned off.
1750GT, YES. Very usefull notice ! Thanks !

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post #15 of 20 (permalink) Old 06-04-2019, 03:19 PM
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Thank you for this info, Pete! But look this foto...
, yeah battery is not an issue!

Hope you have a welding helmet for your dog
Pete
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