The Dynamic Heavy Duty Industrial Welder

The Dynamic Heavy Duty Industrial Welder ad from 1944

The Dynamic Heavy Duty Industrial Welder ad from 1944

I got an email from a gentleman awhile ago asking me about an antique welder – a vintage model 75D Dynamic brand welder with a casing made out of wood. He explained what he knew about it, sent me some pictures of it, and asked if i had some more information on it. Unfortunately I didn’t. As a matter of fact, I’d never seen nor heard of one before. And there didn’t seem to be anything useful that I could find when i searched for it.

As luck would have it, I found a couple of advertisements for this welder in some old magazines. These magazines were from the early 40’s, 1942 and 1944, so I’m going to assume that this welder was for sale from the late 1930’s until sometime in the 1940’s. That’s just a guess though. If anyone knows the exact time frame, please feel free to correct me.

It appears that the Dynamic Super Charged model came first. The ad from 1942 shows this model, and the cost of $19.75. It seems strange that they changed the name from Super Charged to just a plain old Dynamic Welder. To me at least, it seems that the Super Charged version should have been the next logical progression as the original model was refined and the output increased. But, i digress.

Dynamic Super Charged Welder ad from 1942

Dynamic Super Charged Welder ad from 1942

His welder is a Dynamic Super Charged welder. The ad from 1942 is that model, and it sold for $19.50 Looking at the faceplate data from the pictures that he sent to me, the first digits are often the year of manufacture. Since his welder’s serial number starts with 039, it could be that his welder was manufactured in 1939. I think that’s a pretty reasonable guess.

One thing that I found interesting is that the welder in 1944 cost a whopping $23.50! Using an online calculator that I found for determining the value of money over time;

    In 2008, $23.50 from 1944 is worth:
    $287.48 using the Consumer Price Index

Imagine that, $287 for a machine that you could use to earn a living right out of the box. Not a bad investment at the time!

It came with everything you needed to start welding – rods, hood, cables, stinger, and a handy instruction manual that would allow even the greenest beginner to begin making high-grade welds immediately in iron, steel, brass, bronze, and other materials. There was even a 10 day trial offer. What more could you want for $23.50?

I’ve included the full text of the ad for a couple of reasons. The first is that even when you click on the above image for the full size image, it’s still kind of hard to read. Especially for those of us with eyes that aren’t as good as they used to be. The second reason is because I love the cheesy ad copy they used in it. You can also see some pictures of a real Dynamic Welder that were sent to me. Enjoy!

Saves Valuable Time and Money
Now…A Dynamic Heavy Duty Industrial Welder
Works off 110 VOLT Electric Light Circuit
Amazingly simple and easy to operate

This portable dynamic welder easily carried right to the job — plugs into any convenient, properly wired 110 volt light circuit
For only $23.50 Complete

Works on Iron, Steel, Brass, Bronze, and other Metals
Has eight metallic and carbon arc welding heat stages. Does work you would think only possible with a larger, more expensive machine

Maintenance men, farmers, mechanics, machine shops, foundries, auto, general repair and job welding shops using the DYNAMIC WELDER find it so indispensable and useful that they cannot afford to be without it. If inexperienced you can easily learn to do a variety of high-grade welding jobs by following the practical simplified operating and welding instructions furnished.
Once you see a DYNAMIC in operation you won’t want to be without it. Its simplicity will amaze you. In a year the DYNAMIC only costs you about 6c a day. Comes complete, ready to operate, with helmet, rods, cables, electrode holder and operating instructions, etc. Nothing else to buy. Write today for free priority assistance and particulars on how to qualify for one of these amazingly low-priced welders. Act now while they are still available.

Repair Shop Owner Says, “It will do more than you say.”
“I want to say I operate a repair garage and am more than satisfied with the welder. It will do more than you say.”
C.P., Butler Ohio
It’s the Greatest Portable Outfit
“Now I am equipped for all kinds of welding and before I go further I must say It’s the greatest portable outfit for welding any man could ever wish to own. I wouldn’t sell mine for the cost of plenty welders I have seen which were very high in cost but not in convenience. You may put me on file as a booster of your wonderful welding product.”
W.J.B., St. John, N.B., Canada
Better Than I expected
“I have done quite a little welding with my welder and will frankly say it is better than I expected. The price, convenience, and variety of work that can be done with the Dynamic are the attractive points.”
W.R.P., Portland, Oregon.


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14 Responses to The Dynamic Heavy Duty Industrial Welder

  1. Mat The Welder says:

    one’s on sale right now on ebay, cheap! 90 clams or so. seeing it there led me here while i was looking up information.

  2. Joe says:

    I just found one of the model 75d in my great grandfathers
    Thing it came with ad letter from company and
    Owners manual email and I will be happy to email a

  3. Dave Cardwell says:

    Someone directed me to this site after they found out I’d purchased one of these little Dynamic Welders.

    I’m greatful to him and to whoever posted the ads above. The unit I have is in exceptional shap for it’s age. I tried it out and it really welds pretty good.

    I’d never seen or heard of these before and bought it as a novelty since I have 7-8 other welders including a wooden cased Omaha AC welder that functions better than any crackerbox welder today. It probably dates back to the teens or twenties.

    It’s older than anything I’ve found online. I love it and this little Dynamic welder. The Dynamic is going on the workbench to actually be used. It remindes me of the little Forney DC inverter I have…only it’s slightly larger and 3 times the weight.

    It was nice to discover it’s probably around 80-100A max output….which was about what I’d figured considering it’s size and 110v power supply.

    I’d be interested in a manual should anyone happen to find one. (

  4. william ambrogio says:

    I forgot to add that I think but not sure, that the Dynamic Welder Co. also sold an industrial line of welders called Trendle, I have herd of Trendle but, never seen one. William Ambrogio, Weld-it co.

  5. william ambrogio says:

    I bought one of these Dynamic welders in about 1958 or 59 from an ad in one of the hot rod magazines, Rod & Custom or ? I don’t remember for shur which one, but it was $38.95 plus shipping, and it took something like 6-8 weeks to get it. I was only 12 or 13 years old and it worked good on 1/8-3/16 steel, I buned 1/16-5/64 and 3/32 6013 and 6011 rod, it had 4 taps 20-40-60-80 I think. It was 115 volt ac, I remember it kept blowing the 30 amp fuse so I put a penny between the fuse and the contact, I didn’t burn down the house, luckily, ha ha, the outside was made of a pressed board, like peg board, it had only a 2 prong plug, and it came with a stinger made of brass with a wooden handle, 6 ft electrode and ground cord, I opened it up to see what was in it, it had a transformer about 5 inches square, and heavy wires going to each tap, it weighed about 30lbs. boy I thought I was hot stuff when I got it. I gave it away about 8 or so years ago.
    I also had before this maybe a year or so a welder called the Four-Way welder, I got this one out of a hot rod magazine also 1958 or so. It was in a metal box and I took it apart also, there was no transformer, just 2 or 4 heat coils, and it had no heat settings just the one, it drew about 30 amps right out of the wall socket, when I started welding with it the cord was so short that I had to have the welder right next to me, when I was TRYING TO WELD, I caught my shirt tail on fire because the box got so hot, it also came with a stinger that was able to be put together with the ground clamp, to make a carbon
    arc torch, to braze with, it only would work with 1/16in 6011 or 6013, it was hard to use as it would burn through sheet metal but no hot enough to weld anything else, but it was fun, now I weld for a living, William Ambrogio Weld-it co.

  6. admin says:

    Hi James, sorry for the late reply. It’s hard to say what they’re worth since the value of anything is in the eye of the person that wants it. If you’d like, you can register on the forum and post it in the welding classifieds section.

    Not sure how much the lead paint would affect the price since i’m pretty sure a lot of old equipment probably had it too, and i’ve never heard anyone mention it. If there were a true collector of those machines, i’m sure painting it would probably change the value of it. But most likely, someone would buy it to use it.

    The plate roller is definitely worth money. As to how much i can’t say, but i do see tons of old metalworking equipment for sale. And the reason is that the old stuff is heavy duty and usually still works well.

    If you’d like to send some pictures, feel free to email me, or just post them as ads on the forum. Either way, I can get them up for you. Good Luck!

  7. james ozment says:

    hello my name is james ozment ,i inherited a 1940 westinghouse stick has no knobs to change the current,curent is selcted by unplugging one lead and plugging it in a different slot, a true antique,it also came with a high frequency gas welding unit which sits atop the stick welder.can someone tell me the value of the machines and if there is a market for such.i am interested in selling the items,both in good working condition.i think the stick welder has lead paint not sure ,but if it does would it hurt the value of my machine to repaint it?if i get a contack info from someone i will provide photo’s and more info on my machines,also i have a manual plate roller 4′ wide X2″ rollers made in the 40’s has a navy logo on it,does this have any value?

  8. admin says:

    Hi Ron…Hopefully someone may have parts for you. You should post your request in the forum though since there’s a classifieds section devoted to parts. The link is here – Welding Classifieds

    As to what it’s worth, I can only guess. I’ve seen them advertised anywhere from 50 dollars to 200 dollars. Whether they sold for those prices, I don’t know.

    They’re definitely neat old welders though!

  9. ron wilson says:

    To whom it may concern:
    I have recently discovered this beautiful antique in my shed.I am curious to know if someone has the cables and the ground cable looks like as well.I have the sticks the welder but no cables.How much is it worth as well.Thank you sincerely,Ronald Wilson.

  10. mark says:

    it funny i have had one of these welders sense i was a kid a old man on my street gave it to me it is in great shape with all cables so now im going to probly put it on ebay who knows just thought you might think it odd like i did i was just looking for info and found your sight thanks for the info mark

  11. tom collin says:

    I put the ampere meter on it this week had 63 AMPs in the very high output mode AC.

  12. tom collin says:

    Thanks for your input! I think I will get out my amp meter this weekend. It’s hard to weld and get a reading but a friend is coming over and he can help. I will let you know what I find. By the way the rod is E6013 That is 60ksi. 1 flat horizontal vertical over head 3 titania potassium AC or DC. 40-60amp. Still I wish I could read the ad they make it sound like it should do more. And it makes me wonder what low and med are for? The smallest rod I could find is 1\16″. Thanks for all the info, and I will let you know what the amp is. tom c

  13. admin says:

    Hi Tom. If I hear of anyone that has an owners manual for one of these welders, I’ll definitely let you know. Just out of curiosity, I’d love to see one too.

    As to the output, I’m actually very surprised that you can run a 3/32. Are you running a 6011 3/32″ or a 7018ac 3/32″? A 60 series 3/32″ can typically be used with an amperage range of 60-80 amps. You need to have a little more to effectively use a 7018 – 80-100 amps roughly. So depending on what rod you’re using, i’d guess the max output is 60-80 amps.

    I just looked at the pictures of the faceplate again, and the power ranges are listed as low, medium, high, and very high. Kind of hard to tell from that. And since it’s only a 110 volt welder, the max can’t be too high. So I’m going to stick by my guess of 60-80 amps ac output.

    Warning – It’s been a LONG time since I’ve taken any electrical classes, so I may be way off on my following guesses.

    We can look at it another way too. Lets assume that back in the 30’s and 40’s, the time this welder was available, that the average 120 volt household electrical circuit was 15 amps. Lets also assume that it’s DC power so we can avoid power factor, inductance, reactance, etc.

    If we put this into ohm’s law-

    Power = (current)**2 x (resistance) Or Power = (voltage) x (current)

    We can arrive at a rough guess of how much power was available in an average household 120 volt circuit.

    Power = (120 volts) x (15 amps) = 1800 watts.

    I realize that this is for a dc circuit, and i’m not taking into account the power factor, whether it’s a capacitive circuit or an inductive one, etc. This is a very ROUGH guess. The real value will be less than this. So I think it’s a fair assumption that based on a 120 volt circuit with a 15 amp fuse, there would be at least 1600 watts available.

    Since we have a guess of the voltage and the current, we’ll use the second equation. So for the time, we had available roughly 1600 watts at our disposal.

    Now, if we work backwards with some more assumptions, we can use this 1600 watt available power number as our power rating, and then plug in our assumed output voltage of the welder.

    1600 watts = (25 volts) x (max output current)
    Max output current = 64 amps.

    Now if you play around with the output voltage, say from 20-30 volts, you’ll have a range of 53 – 80 amps.
    The same is true with the available wattage.

    I know this is a pretty contrived explanation, but i think it helps to substantiate my initial guess. And if anyone better at math and electricity cares to chime in please do. I’ve probably overlooked something, or made an improper assumption.

    In any event, I’m sure I’ve said way more than you wanted to hear!

  14. tom collin says:

    I don’t think you can tell the date from the model
    number, but I have a super charged. My first digits are
    D6L 106. Does anybody know how many amps the super charger is rated max? I know that it’s AC output. My welder burns 3-32″ rod max. It sounds like it should burn a little more rod. If any body has an owners manual I love to buy a copy.

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