Buying Welding Equipment Options

[saigon71]

I started looking into welding equipment for body/hell hole/jackstand repair of my 914. A friend told me that MIG is the way to go for this. My question is what specifications do I need in a MIG welder to get the job done without a lot of grief? Also, what gage steel should be used for making patches?

Thanks

[jmill]

Actually I don't agree with that at all. Inexpensive 220V units generally let you weld thicker metal single pass than 110V units, but the lower settings are pretty much (if not idential) on 110V vs. 220V.

I have a 220V and a 110v. I agree to disagree with you if you have stepped power settings. Say the 110V has 10 power settings and the 220V has 10 power settings. The 220v power settings will be spaced further apart than the 110v. You have a closer gap on the thinner stuff using the 110v. All bets are off with infinite. Then I agree to agree. (IMG:style_emoticons/default/beerchug.gif)

[Richard Casto]

Actually I don't agree with that at all. Inexpensive 220V units generally let you weld thicker metal single pass than 110V units, but the lower settings are pretty much (if not idential) on 110V vs. 220V.

I have a 220V and a 110v. I agree to disagree with you if you have stepped power settings. Say the 110V has 10 power settings and the 220V has 10 power settings. The 220v power settings will be spaced further apart than the 110v. You have a closer gap on the thinner stuff using the 110v. All bets are off with infinite. Then I agree to agree. (IMG:style_emoticons/default/beerchug.gif)

(IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/smile.gif) Not being argumentative, but I have a slightly different perspective…

Since we are talking about inexpensive welders, infinite control (other than wire speed) is out of the question. So for example the units you might buy at a Lowes or Home Depot (Lincoln or Miller) would probably have 5 voltage settings (labeled A, B, C, D, E). Both the 110 and 220 units will probably have 5 settings. So yes, the range on the 110 is going to be smaller. So you are technically right about the voltage selection. But I will say that from a practical point of view it doesn’t make a big enough of a difference to matter.

Think of it as being a close ratio transmission. It all sounds good and you “think” it’s going to work better for you but your gearing needs to be matched up to a specific engine and track. So you may have a close ratio 5 speed, but you are not on a road course, but rather an autocross. So you are using 2nd gear nearly all of the time and maybe 3rd sometimes. It may turn out that the transmission without the close ratios may actually work better. Or, the lap times are so close that there is not a statistically significant difference.

So when welding the thickness of metal that you will find on a 914 body panel, the end result is that you are going to be using one maybe two voltage settings on both the 110 and 220 units. As with the transmission example above, it’s just as likely that the settings on the 220 unit might work better than the 110 unit. With proper technique, there is going to be voltage and wire speed settings on both the 110v and 220v units that is going to work just fine on a 914.

In reality, welding technique is going to be a much larger factor than if “setting B on a 110v is better than setting B on a 220v unit”. Of the many threads you see here with people learning to weld, by far the biggest problem that people have is technique (not welding on rust, paint grease, welding speed, distance, angle, etc.) and not issues such as 110v vs. 220v.

So, I am not trying to push anyone to a 220V unit. If you are talking about welding on a 914 I would recommend the 110V unit for a number of reasons. My comments are just to not let anything think that a 220V is going to not work, or not produce just as good as results. I would hate for someone to have access to an existing 220V unit (friend, etc.) or find a great deal on a used 220v unit, already have a 220v outlet in their garage and then read this thread and think “Oh, a 220v unit it just going to blow holes through my car” (which is 100% inaccurate), then go out and spend more money on a brand new 110v unit.