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Hope this isn't too basic a question. I have only been welding a few months and have read several books and online articles plus watching YouTube. Many of the resources discuss short-circuit, globular, spray transfer, etc. for mig welding. But I don't understand how you implement each. Is it just automatically determined by the settings you dial in on the machine or are there techniques that need to be used? For instance, I am planning on fabricating an implement to use on my tractor's 3 pt. hitch using 1/4" and 1/2" steel. If I start with the suggested settings from the chart on the Miller 252 do I do anything different with settings, stick-out, distance from joint, etc. to use spray transfer or will it happen on it's own when I dial in the higher settings? I have both C25 and 90Argon/8CO2/2 O gases.
Reply:Read the ENTIRE reference previously linked to you. Loaded with technical explanations on GMAW."Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:Generally volts determine what mode of metal transfer but you need higher argon content in your mix to get into full spray mode. Spray mode is only good for flat and horizontal welding. You have the correct gas for spray mode but it requires a little more skill to run because it is so hot and fast. The chart on 252 will get you in the ballpark but it probably lists what shielding gas the settings are for as well.
Reply:Thanks for the replies. I read some more of the Lincoln and Miller articles and read the GMAW chapters in my Jeffus text which gave the best explanation. And good point about the position and gas Dave. It appears that if I wanted to practice spray transfer (on horizontal with the tertiary gas I have) that I just keep increasing the voltage and amps until I hear the sound change and observe the transfer off the tip. Most of the resources just explain how the process works but doesn't explain how to get there. I was probably trying to make it more complicated than necessary. They are calling for sleet and freezing rain here in NC so I might want to practice today before I lose power! Thanks again.
Reply:Originally Posted by ALincarolinaThanks for the replies. I read some more of the Lincoln and Miller articles and read the GMAW chapters in my Jeffus text which gave the best explanation. And good point about the position and gas Dave. It appears that if I wanted to practice spray transfer (on horizontal with the tertiary gas I have) that I just keep increasing the voltage and amps until I hear the sound change and observe the transfer off the tip. Most of the resources just explain how the process works but doesn't explain how to get there. I was probably trying to make it more complicated than necessary. They are calling for sleet and freezing rain here in NC so I might want to practice today before I lose power! Thanks again.
Reply:You need to use a gas with a minimum of 85% argon to achieve true spray transfer. The transfer is dependent on the gas used, machine settings and wire size.
Reply:Thanks iongar. We didn't get it too bad with the weather. All the roads were covered in ice and snow but had to get to work. Luckily I have a 3/4 diesel PU. I generally have two options here when this happens: wait until the stuff melts or leave extra early so I don't get stuck behind some yahoo blocking the road because they can't get up a hill. I opt for the latter. One of the guys I work with parked in our parking lot and looked out later to see his vehicle had slid down to the other end of the lot, good thing nobody was parked at the bottom. |
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发表于 2021-8-31 22:08:19