Question about Lincoln Welding Tools

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Lincoln power mig 300.when i weld, the wire globs in puddles on my work piece. i have tried adjusting speed and voltage. i need a direction to follow to fix the problem.

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  • Michael Jones
    Michael Jones Apr 09, 2011

    i found the problem. i have a push pull gun and the nozzle assy. was not seated all the way in. this caused poor gas flow and incorrect voltage sensing. it turns out the welder automaticaly senses the voltage differences and adjusts accordingly. i cleaned and reseated the nozzzle assy. and she fired right up.thank you for your help.

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Hi:

Sound like you have the wrong polarity for the wire you are using. Without knowing what kind of wire you are using, check the following:

A) If using inner shield wire (gasless wire) your ground clamp must be connected to the positive (+) side and your ground cable to negative.

B) If using metal core wire (need gas) ground clamp must be on negative side.

Polarity change it's done on the upper side of the drive rolls.

Good luck.

Posted on Apr 09, 2011

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Mig Guns & Mig Gun Spares - The Welders Warehouse

www.thewelderswarehouse.com/Welding/Mig-Welder-Gun.html
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1 Answer

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Hi,
Let's troubleshoot this one:
1) Make sure you have the right polarity for the wire you are using: Innershield wire (no gas) ground clamp must be on the + side. Solid Wire (gas use) ground clamp to negative side.
2) If gas is used: Mild steel welding requires Argon/CO2 mix 75/25 or 90/10. Using pure CO2 you will create a lot of sparks and a lot of fumes. Stainless Steel welding requires a Trimix gas of Argon/Helium and CO2. Aluminum Welding requires pure argon. Any use of gas requires a steady gas flow of no more than 25 SCFH. If you use more than that or less you will find porosity on the welding.
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Hi:

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A new liner will cost you around 20 buck at your nearest Praxair welding store.

If this was useful to you please vote. Thanks

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It takes a lot of practice to be a decent welder you also need to know what voltage and wire speed settings to use for a given thickness and type of material. 

You don't mention shielding gas, if you are using a flux core wire you don't need it, but if you are using regular wire you do. 

If I may make a suggestion, If you really want to learn how to weld, find a community college near you and take an introductory welding class. You will get a wealth of information and practice on different welding processes. The instructor will work with you and get you welding much better and faster than you will on your own. Most importantly you will get a lot of safety information.

This is a good introductory book:
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