I understood it just fine.......and agree 100%
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At 04:05 AM 1/17/01 , you wrote:
>Gas Shielding:
>
>This is not easy to explain...bear with me!
>
>The reason you do not want to use argon with a mig gun is called "low
>ionization or cold shutting". Argon allows that the gap between the end
>of the wire and the work be very small when the arc jumps. This causes a
>small crack at the toe of the weld. The weld will look very good but it
>can fracture. Using a 80/20, Co2 / Argon mix will cause a high ionzation
>( a bigger gap) and allow the metal to come to temperature before the
>filler metal hits the area. Straight Co2 will typically have more
>splatter around the weld as compared to a 80/20 mix.
>
>Stick Welding:
>
>If you burn thru, which is easy welding .125 wall tubing, the metal on
>the inside of the tube is now brittle because it is not shielded by the
>flux on the rod. This CAN cause a weld fracture. This is why NHRA has
>banned the use of stick welding on all race cars.
>
>Mig Welding:
>
>Nascar uses mig welding over Tig probably because of the miles of tubing
>in one of those cars. Teams in the know, are now TIG welding the
>chassis.
>
>
>We all have had experience welding up cars/bikes that have held up thru
>crashes and years of abuse using mig, gas, arc and tig. Dollar for
>dollar, I spend the time to tig all tubing as from education in
>metalugy, I have concluded that it is the best welding process for thin
>tubing. I have a book from a gas supplier outlining the proper uses of
>shielding gas and am willing to try to scan some approprate pages in to
>my computor if someone would like to see them.
>
>I'm not a teacher so I hope I have explained this so everyone can
>understand it!?!
>
>joe
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