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Tool Talk Discussion Forum

Miller Dynasty 300

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Puddles

05-19-2008 11:26:43

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Year or so ago I got it in my mind I wanted to learn how to weld aluminum. So I bought a Miller Dynasty 300. With the help of T_Bone and others on the Internet I got a fast track to learning how. I have my moments, but oh can I butcher a weld at times, but this Dynasty does the majority of the work. My first project was a 60-gallon gas storage tank. The last project I just completed is a stand for a 120-volt hydraulic pump I will use on my shop press, and other things in the shop.

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mjbrown

05-20-2008 09:59:20

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Re: Miller Dynasty 300 in reply to Puddles, 05-19-2008 11:26:43

Nice work!! I thought I was pretty handy until I saw your work!;-) Is that an old Gold Star next to the new one? I have one of those and they do an real nice job of tig welding too.

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Puddles

05-20-2008 10:55:02

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Re: Miller Dynasty 300 in reply to mjbrown, 05-20-2008 09:59:20

Hi mjbrown.
Trust me, I� am no way a Tig welder! In fact I misspell Tig most of the time. That is a Gold Star. But in comparison the Gold Star should not be in the same room as a Dynasty. Night and Day my friend!

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s.crum

05-20-2008 08:30:03

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Re: Miller Dynasty 300 in reply to Puddles, 05-19-2008 11:26:43

Looking pretty good! One suggestion, practice leading off your weld bead when you are preparing to stop the weld, this will eliminate the 'pith hole' where you break the arc which could leak fluid later. Then get in the habit of restarting your weld 1/4" to 3/8" back on the bead you ended on. This practice will help prevent a 'cold lap' that can be weak and leak.
That Miller is a good machine.

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Puddles

05-20-2008 10:56:20

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Re: Miller Dynasty 300 in reply to s.crum, 05-20-2008 08:30:03

Hi s.crum
When you say �leading off your weld bead� are you saying to back off the pedal? And feather the power back to stop? If so, I think I have a bad habit of just stopping. I need to work on that, and about a million other things I do wrong! :o)
Any other suggestions, I�m all ears!

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s.crum

05-20-2008 22:24:20

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Re: Miller Dynasty 300 in reply to Puddles, 05-20-2008 10:56:20

Actually the lead off technique is from the old scratch start TIG days before foot pedals and thumb contols became the norm. To lead off means that when you want to stop the weld you lead the arc away from the weld onto the new metal while lifting the tungsten further away causing the arc voltage to decrease and penetrate less. This equally applies with the foot pedal at least on stainless. Many do this and some don't, but I often make a $50 bill or more following the "some don'ts" to make a 5 minute repair.

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Puddles

05-21-2008 03:12:12

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Re: Miller Dynasty 300 in reply to s.crum, 05-20-2008 22:24:20

Oh I remember now! It�s probably been 25-years since using a scratch start.

Ok, rotate your hand / torch towards direction of travel, back off the pedal until arc is extinguished. Then I have to remember to rotate back real quick for gas coverage. Got it, thanks for jogging my old rusty memory! :o)

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