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Darkening Mig
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How do you weld with a wire welder?
Man, that's a loaded question. Why? because there are so many applications where a Mig welder is used.
First off, lets gets some terminology cleared up. The AWS (American Welding Society) would appreciate it if we all called it Gas Metal Arc Welding. They have been working on that for over 20 years... Even though about 90% of all welders still call it "MIG". They just wont give up.
I call it MIG too. But some people just call it "wire welding".
It doesn't matter what you call it, its the same thing. So let me give you a few tips on how to weld with a wire welder.
Lets start off with the little 115 volt wire welders. They are the best thing since sliced bread for auto body panels and thin sheet metal. The Hobart Handler 140 is a good machine for welding auto body panels because it comes with a gas conversion kit.and will run small .023" wire.
You need .023" bare E70S6 wire, 75/25 Argon CO2 gas, and a steady hand. Always weld thin sheet metal downhill when you can, and in short runs with an air nozzle handy to cool each half inch bead before you start the next one.
For trailers and trailer hitches, ditch the 115 volt mig welder and step up to a 230 volt mig welder.
The Hobart Handler 187 is a good choice. It will run .023" wire for thin sheet metal, but also will go up to 185 amps and use .035" bare wire or flux core for thicker metal where penetration is critical. You still need 75/25 gas and some E70S6 bare wire. But you can use .023" bare wire for thinner steel and .035" bare wire for higher amperages.
So how do you weld with these wire welders? Here is the rundown...
- Make sure the machine leads are hooked up with the electrode positive.
- Set flowmeter gas flow to about 20-25 cfh
- Use the right size drive rollers to match the wire you are using
- Make sure the contact tip is flush with the nozzle
- Set Voltage and wire feed speed using the chart that comes with the machine you are using.
- Hold the torch close to the work so that there is only about 1/2" of wire sticking out from the contact tip to the weld.
- Dont get carried away with torch angle...5-10 degrees works in either direction for most applications.
- Practice on scrap before you weld the real deal.
- If the weld you are making is critical, do some destructive tests with a hammer on a mock up weld first.
- get an auto darkening welding helmet so you know exactly where to light up
Read a Ton more Mig Welding tips along with Down and Dirty welding tips. For TIG, MIG, STICK welding along with a buttload of other welding information, visit http://www.weldingtipsandtricks.com/
The Basics Of Welding In A Nutshell
Simply put, welding is a metal fabrication process by which two pieces of metal is connected into a huge structure. The location to be joined is heated to melting using torch or electrical arc and additional metal material in the form of welding rod or welding wire is used to fill the gap. The welded connections are as stronger as the base material or even more.
There are three basic types of welding. They are the Gas welding, Arc welding and Spot welding. In the gas welding, a gas torch is used to heat and melt the base metal. Commonly a mixture of oxygen and acetylene is the gas combination used for gas welding. They are usually used for welding pipes. The gas welding is also used for brazing, cutting and heating metal for bending since the temperature of the torch flame can be varied.
The Arc welding uses an electric current to melt the base metal. There are different types of arc welding available for handling different metals, equipment and conditions. Each type would be suitable for welding a specific metal. For joining thin sheets of metals, the spot welding is used in which an electric current is used to create a weld at a single location. This type of welding is largely used for robotic processes. The robots are capable of performing large number of spot welds in automobile assemblies. There are also more recent innovations in welding like beam welding which are used for specific applications.
In almost every industry from automobiles to electronics, the welding is being used. Welding can be even performed underwater or in the vacuum space if the welder is given the appropriate equipment. Even though the welding is generally performed on steel parts, the aluminum parts are also welded together. Some aluminum alloys are particularly easy to weld.
As the welding involves high levels of electric current, gases and temperature, it is important to take certain safety measures while performing welding. The welders are advised to take extreme care for protecting themselves. Some safety equipments like welding masks, gloves, aprons and coveralls.
The welding masks are shields that cover the head and neck and have darkened glass to protect eyes from high intensity of lights of the welding spark. The masks would be hinged so that the welders can easily remove the mask to evaluate his work without fully removing the mask. During welding, sparks are thrown off and this would heat and burn the welder's hands. So for protecting welder's hands, the gloves should be used. It is always suggested that the welders should wear leather aprons and coveralls for protecting themselves from the heat and gases. Sometimes the welders are seen to be operating behind tinted shields. This is to prevent passersby from seeing the welding sparks directly.
The main advantage of welding process is that it creates a permanent and strong bond between two metal parts that would not shift or break over time. It is basically a process of melting and joining metals locally by which a strong bond is created.
About the Author
Gavin Bone is an author for Welders. He has written articles Plasma Cutters. For information visit our site tig welder
Welders...what number shade helmet do I purchase for MIG welding?
I am looking into purchasing an auto darkening helmet and the cheaper ones are 10 only. Is that not good?
Harbor Freight has one on clearence for $79 bucks it is adjustable-8 to 13 then you can get the darkness you want.
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