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welding a propane tank

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welding a propane tank

Postby burnttoast » Fri Jan 19, 2018 2:44 pm

Hello all, I'm in the process of making a diy grill out of a 20lb propane tank. I made a mistake cutting out the opening and now have to weld the piece of metal back on. I have a Lincoln 225 ac welder and some 6013 5/64 rods and 3/32 rods. I measured the thickness of the metal and it's a little thinner than 1/8th thick. I'm just a hobbyist welder, so I'm not an expert. any tips on how to weld this without burning through? also, do I need a chimney on this, or can I just keep the door open. Thanks
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Re: welding a propane tank

Postby Poland308 » Sat Jan 20, 2018 12:35 am

How did you cut it? Obviously it’s not full of gas anymore. I would guess the 3/32 6013 at about 75 amps would be ok.
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Re: welding a propane tank

Postby burnttoast » Sat Jan 20, 2018 12:48 am

nope there's no gas in it. I used my angle grinder on it.
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Re: welding a propane tank

Postby Poland308 » Sat Jan 20, 2018 12:58 am

If you had 7018 in a 3/32 I’d suggest about 70 amps. Do you have a tig option?
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Re: welding a propane tank

Postby ljdm1956 » Sat Jan 20, 2018 2:59 am

burnttoast wrote:nope there's no gas in it. I used my angle grinder on it.

Were you a little nervous using the angle grinder (sparks) to cut it? I dont know if it is the same as a gasoline tank, as far as fumes left in the tank.
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Re: welding a propane tank

Postby aland » Sat Jan 20, 2018 4:36 am

ljdm1956 wrote:
burnttoast wrote:nope there's no gas in it. I used my angle grinder on it.

Were you a little nervous using the angle grinder (sparks) to cut it? I dont know if it is the same as a gasoline tank, as far as fumes left in the tank.


I've done it before, just remove the connector off the top, fill with water, then empty and let dry for a bit before cutting. Once you fill it with water, it's pretty safe after that. You can add a bit of dish soap to ease your mind.
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Re: welding a propane tank

Postby LanceR » Sat Jan 20, 2018 10:59 am

As has been said, purging a propane tank is as easy as filling it with water. Dawn dish soap and some TSP can help a lot in getting the smell out.

If you are going to use steel strapping around the door it helps to make the side cuts for the door and enough of the top and bottom cuts to weld on the strap and hinges before cutting the rest of the top and bottom seams. That will cut down on the likelihood that the door will want to spring out of shape when it gets cut free.

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Re: welding a propane tank

Postby burnttoast » Sun Jan 21, 2018 1:29 am

got the metal welded back on. used 3/32 6013 rods. I have a lincoln 225ac welder. no option for tig. had a burn through because of a slight gap. had to go over it a few times to close the hole. I had taken the valve off and flushed it out a few times with water last summer. so I was pretty sure there wasn't any gas in the tank. I watched a video where this fabricator who builds bbq grills in his backyard had an explosion while trying to tack a 55 gallon drum. luckily he wasn't seriously hurt. here's the video. at 4:31 he explains his mishap. https://youtu.be/C9218a8_L1Q?t=12s
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Re: welding a propane tank

Postby tweake » Sun Jan 21, 2018 4:02 am

see how he had the bungs in the tank. big mistake.
simply removing the bungs drops the explosive factor by a lot.
tweak it until it breaks
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Re: welding a propane tank

Postby aland » Sun Jan 21, 2018 4:33 am

burnttoast wrote:I watched a video where this fabricator who builds bbq grills in his backyard had an explosion while trying to tack a 55 gallon drum. luckily he wasn't seriously hurt. here's the video. at 4:31 he explains his mishap. https://youtu.be/C9218a8_L1Q?t=12s


I have watched many of his videos and I have a love/hate feeling for him. He's Hillbilly Fabrication at it's best, and I can't help but admire the DIY effort he exerts, but he's always doing some dumb stuff like tack welding with a mig and no gloves or sleeves on, one needs to watch him and understand what NOT to do what he does. He often tacks just a couple inches from his fingers with no gloves on... :?

He doesn't seem to worry about the UV either, often no protection on his arms, just not a very good way to weld, IMO.

It's amazing that he builds so many smokers and 'ques without getting hurt more, but somehow he survives. He sure got a blast in his face on that one, cause he's pretty char'd after the tank exploded on him... :lol:

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