Mig Tig or Arc - Page 7 - Alfa Romeo Bulletin Board & Forums
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post #91 of 106 (permalink) Old 09-29-2012, 12:47 PM
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Sounds interesting... your link is dead tho...

Red 1974 Spider (Restoring!)
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Blue 1974 Spider (Sold 12/2016)
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post #92 of 106 (permalink) Old 10-31-2013, 07:10 PM
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If all goes well I will get a great deal on a Lincoln Pro-Mig 140 this week. Supposed to only have about 5 hours of usage on it.

Any idea on gas usage? I see bottles from 20 cu ft to 150 cu ft

What are the options on gas?
Buy?
Lease?
Exchange issues?

At work we have about 200 cylinders of calibration gas from Airgas, a few from Matheson and a few from Air Liquide (Scott Gas) but dont know if that will do me any good.

Thanks
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post #93 of 106 (permalink) Old 10-31-2013, 07:40 PM
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I bought my bottle. It is about 3' high, not sure of the size. I just take it to the supplier and exchange it for a full one.
You'll be glad you did.


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Originally Posted by 86spider View Post
If all goes well I will get a great deal on a Lincoln Pro-Mig 140 this week. Supposed to only have about 5 hours of usage on it.

Any idea on gas usage? I see bottles from 20 cu ft to 150 cu ft

What are the options on gas?
Buy?
Lease?
Exchange issues?

At work we have about 200 cylinders of calibration gas from Airgas, a few from Matheson and a few from Air Liquide (Scott Gas) but dont know if that will do me any good.

Thanks

Gary
74 Spider - Completed; Tuning Weber's
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post #94 of 106 (permalink) Old 10-31-2013, 08:12 PM
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sounds like an eighty cu ft cylinder.

How much welding time to you get from it?

Do you exchange at a welding shop or direct with a gas supplier?

Thanks

Wayne
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post #95 of 106 (permalink) Old 10-31-2013, 08:20 PM
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I did all the welding on my car with I think less than two bottles. Adjusted the flow so it was sufficient but not excessive.
Exchanged them at the weld supply shop, about $35 I think.

The flux core welding wire did not work for sheet metal. Got the best results on sheet metal with the smallest wire diameter.

Practice a bit and you will get the hang of it.

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sounds like an eighty cu ft cylinder.

How much welding time to you get from it?

Do you exchange at a welding shop or direct with a gas supplier?

Thanks

Wayne

Gary
74 Spider - Completed; Tuning Weber's
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post #96 of 106 (permalink) Old 11-12-2013, 11:54 AM
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I've been looking at this new system called Multiplaz. A bit on the pricey side but in the scheme of things I have always preferred torch welding over MIG, just more versatile and affords better control but the gas can get expensive too. This unit claims to have plasma cutter capabilities as well and uses a simple water/alcohol mix, no pressure bottles at all.

Paul - 1972 Spider - (2)1991 164S's - 1983 308 - 2001 Discovery - 1997 F350
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post #97 of 106 (permalink) Old 11-13-2013, 12:53 AM
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That looks an incredible tool. I pay $56 per month just for rental of bottles (oxygen, acet, and argoshield) and over $100 to fill them ("D" size). Anyone in Australia know Aust $ cost?

Richard J
'65 Giulia Ti, '69 GT Junior, 72 Spider, '74 2000 GTV, ,`00 156
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post #98 of 106 (permalink) Old 11-13-2013, 01:14 AM
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That looks an incredible tool. I pay $56 per month just for rental of bottles (oxygen, acet, and argoshield) and over $100 to fill them ("D" size). Anyone in Australia know Aust $ cost?
Here A$2,295./

Looks like a really interesting tool.
How does it actually weld, do you hold a filler rod like TIG?

(I only have acetylene and MIG experience)
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post #99 of 106 (permalink) Old 11-13-2013, 09:19 AM
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There are several videos on the website. There are two "modes" you can use for welding and cutting. Mode 1 is like an oxy/acetelene torch while mode 2 is like TIG. In both cases you manually feed a separate filler.

The only drawback I see is that the torch is about the size and shape of a hand drill and looks to me as though it would be somewhat unwieldy (pun intended) in many applications. It also seems as though it would interfere with your sight picture which is very important in welding because it's already hard enough to see what you're doing.

Paul - 1972 Spider - (2)1991 164S's - 1983 308 - 2001 Discovery - 1997 F350
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post #100 of 106 (permalink) Old 11-13-2013, 08:27 PM
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I`ve got a Henrob/Cobra gas set and using the gun hand piece is fine although at first it seems big and awkward you soon adapt. Some of the bigger mig hand pieces are also quite bulky. I am sure you would adapt as the fusion process itself is taking place at a small distance from the tip.

Richard J
'65 Giulia Ti, '69 GT Junior, 72 Spider, '74 2000 GTV, ,`00 156
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post #101 of 106 (permalink) Old 01-21-2014, 09:56 AM
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Oxy-acetylene vs Mig welding

Just posted comments and photos at thegiuliettashop on Oxy-acetylene vs Mig welding.

Lionel
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post #102 of 106 (permalink) Old 01-21-2014, 04:01 PM
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I`ve got a Henrob/Cobra gas set and using the gun hand piece is fine although at first it seems big and awkward you soon adapt. Some of the bigger mig hand pieces are also quite bulky. I am sure you would adapt as the fusion process itself is taking place at a small distance from the tip.
I've got 1 too. A very capable piece of equipment that I've used to make all sorts of things with.
Something that tends to get a bit misunderstood about the Henrob/Cobra/DHC torches is that they are very different to a typical Oxy/Acetylene torch in that they give a much more focused flame with much lower gas velocity (they also cost heaps more in Aus...........). This lets them give more accurate welding work than a typical gas torch as well as be able to weld much thicker material. The low gas velocity allows you to bridge some pretty big gaps, too.
The other thing I like about them is that the weld is very ductile and has much less stress about it than a MIG weld does. This is easily seen by how much a piece will move when a corner is tacked. A typical MIG tack can pull considerably as the weld cools. With a Henrob tack, the piece will move much less.
I've only done small amounts of body welding with my torch, but I've made 2 turbo manifolds with it, welded up (yes welded, not brazed or soldered) )a hollow/water cooled copper bus bar and and high pressure hydraulic stainless steel lines (both for work), repaired a thin walled muffler or 2, seam welding in the engine bay of my 75 plus added chassis bracing. Made all sorts of exhausts and extractors. Mounting points, intercooler plumbing (in mild steel exhaust pipe), power steering lines. Used it to heat things to expand or bend them. Soldered copper tube.
Down sides are that you do have naked flames going places where you might not want them to go and the torch can be a bit bulky at times.

And I can't weld aluminium for ***** with it.............

So I just bought an AC/DC inverter TIG.

Slowly Progressing Vortech Supercharged 1990 Alfa Romeo 75 Potenziata. Out of Action Twin-Charged 1988 AW11 MR2. Current Daily Driver, The Glorified Taxi 2006 BF FPV F6 Typhoon.

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post #103 of 106 (permalink) Old 12-07-2014, 05:33 AM
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Get yourself a MIG welder, both Miller and Lincoln make more than adequate 115v welders that can do just about anything that you will need to weld on your car. I would recommend getting something like the Lincoln SP-135, I've used this style for years on my car and have had no problems with it. I would also recommend getting an auto-darkening helmet it makes it so much easier to get to confined areas.

I have a website with lots of pictures of my restoration.
Alfa Restore

Let me know if you need anymore help.

Jeff


What temp and wire speed setting do you use for sheet metal. I've got a 115 v Lincoln with shielding gas.

Thanks, Mike

1974 Spider Veloce

Last edited by MCain; 12-07-2014 at 06:01 AM.
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post #104 of 106 (permalink) Old 12-07-2014, 06:35 PM
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good question mike..i have a Lincoln as well...I know it's going to be trial and error, but hope someone here (or weldingweb), can give us a general idea

1969 spider
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post #105 of 106 (permalink) Old 12-26-2014, 07:02 PM
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I bought a 115v Hobart about two years ago and use a 25% CO2/75% argon shielding gas. I can confirm the manufacturer's recommendations for voltage and wire speed for a given material thickness are usually on target. Any problems I was having with weld quality were typically related to some other flaw in my technique or surface preparation.

Rich Hanning
'65 Sprint GT, '78 Spider, '88 Quad
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