Cobra DNC 2000

Ed these things get quite a lot of discussion here on the internet.

makes two torches a model 50 and a model 18 which have gas saving on off switches. NTT and others make gas savers which have a pilot light and an on off feature. If you are interested in saving gas as most farms are kind of far to go and get gas cylinders exchanged. There also is a device with two carbon electrodes which make the arc between them which uses no gas and can throw major heat. I have mine hanging and haven't used it lately but that is also a possibility. I know that torch I see at the link above wouldn't fit into the last braze repair I did, well at not least in all the angles and positions I used.

If you can find a link to all of the available cutting nozzles for those things please post it. If you have the victor torch that takes the normal sized tips not the tiny ones you well know there are an incredible amount of options. You said farm not sheet metal shop.

Fran

Seems I'm always needing to repair something cast aluminum, or cast iron, or weld something too thick for my 225 Lincoln.

They make a lot of claims about the performance of this torch like, "weld like a tig, cut like a plasma", makes it sound awfully good.

Hoped I might find some people here with some first hand experience.

It must have been discussed her which got me entering things like henrob acetylene review in search engines to find stuff like this.

You might try and download all the available headers from your server and search for henrob. Not everyone likes to find their old stuff and paste it in a new thread.

Welding is a thing that takes some level of skill some processes take more than others. The henrob or whatever it is now called is generally compared to aircraft sized torches. You sure aren't going to want to weld an steel or iron very thick with it as the heat thrown off is too great to hold that close and the gasses used are many cubic feet. Can't you use nickel rod for the cast iron, heat it in a charcoal fire and cool it in the fire when done. Arc weld or is that only good for dc.

As for the cast aluminum I would use tig and bake it in an oven to hopefully purify some of the contamination. I have some low temp alloy which seems like the stuff you see guys repairing beer cans with which won't risk a collapse as a first attempt. Have you tried welding aluminum with the set up you currently have?

Seriously like I stated before the way to save gas is to have a device which you flip a switch or hang the torch on which eliminates fiddling with the knobs for the most part. I have mine attached on top of a 2"x2" wood picket with a hook which fits the cutting torch just behind the nozzle where there is a little ridge. Clamp the wood picket to something handy and hang the torch up. It fits in with a welding head on as well some way.

You have got to compare apples to apples so to speak. if the henrob or cobra thing is a low pressure injector type compare it to a low pressure injector type with a properly sized injector for that tip. How many welding heads consisting of mixer and tip do you currently have? Sure if you have two or three and get a new set of this thing with seven different sizes it will surely work better for you with a properly sized tip.

I don't have one or even seen one but it is kind of intresting how curious folks are about them. From what I have found on the internet for steel the impression is that it might have advantages for sheet but not really for aircraft tube.

Fran

Will do.

Seems I have had my best results in the past heating and brazing with a large tip or rose bud. But the Cobra folks are touting cast iron repair, and I am doubtful. That's why I wanted to look for first hand, unbiased experience here.

Just have to take it elsewere now. I have tried some brazing rod I bought at a trade show, but had very mixed results.

Well the gas savings is actually a secondary interest in the Cobra torch. Most jobs I only have to light the torch once, but your hanger sounds like a nice idea.

I have three welding tips, a rose bud and a cutting head with three tips. But I get a lot of distortion when trying to gas weld sheet metal. The Cobra folks demo seems more successful. They were continously welding samples with little or no distortion, that I would have to tack in many places, and their getting less distortion. But is that just because their demonstration guy has a great deal of experience with the Cobra torch? I wonder if my results will be anywhere near as good.

That's what I am wondering, and no, I have no plans to weld tubing.

Thanks for your help. I will continue to search the internet, and check back here as well.

Ed