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Gas welding question

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Gordy MN

07-08-2004 18:16:16

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I am heating up some old pins (about 1 1/4") to free them up from where they are inserted into a pipe. They are rusted together. I cannot seem to get them hot enough with the tip I am using. The heat disapates and I cannot get the pin (or rather the pipe)hot enough. I did manage to get one pin out, but it was a real job. When I was in a welding class my instructer talked about a "rosebud" tip that would be used specifically for what I am doing - heating something so it can be separated. I do not have one. My question: is this tip really that good? That is if I buy one will it be 50% better, or only a slightly better? Thanks for the replies. Gordy MN

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Vern-MI

07-12-2004 14:07:36

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

Apply poly using a lint free rag on all sides of the moulding. After application of each coat of poly let it dry in direct sunlight and it will dry very quickly. Sand with 320 after each coat. Use a minimum of three coats.

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Vern-MI

07-12-2004 14:09:59

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Re: Re: Gas welding question in reply to Vern-MI, 07-12-2004 14:07:36

Wow, I must be having a loose wire day. Posted under wrong question. Sorry.

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T_Bone

07-09-2004 08:46:06

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

Hi Gordy,

A rosebud will putout considerable more heat volume than a brazing tip as it speads more BTU over a larger area.

As stated below, for small jobs a cutting tip can be adaquote heating.

I use a "O" size brazing tip for alot of my heating projects. This works well for me. I can get about 10 times the amount of heat spread than using a cutting tip.

As stated below I think your removal techinque needs improving. Heat the pipe allowing it to swell then drive the pin out. Around 600� is all thats is required but will remove the temper from the sleave "if" the sleave was tempered. To retemper when done, heat too 500� then quench in oil until cool. A lead tire weight melts at about 500� and makes a good temp stick.

T_Bone

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Denny

07-08-2004 20:57:33

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

It's hard to say what you need without knowing how big a job you are working on, as in how big the pins or the pipe might be, but, unless you are trying to heat up a really large area, you probably don't need a rosebud, a lot of people make the mistake of using too much heat to get the job done, and that could be your problem, if the pin is tight in the hole, try just heating the pipe around the pin and not the pin it'self, the idea is that heat will expand the hole making it larger, while the pin stays pretty much the same size, if you heat the pin and the pipe togather, they will both expand at the same rate, and you have defeated your purpose, like I said, it's hard to say what the problem might be, I have been gas welding and using heat to free things up for forty plus years, and have only needed a rosebud a couple of times, hope that helps, Denny

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Mike L

07-09-2004 21:36:22

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Re: Re: Gas welding question in reply to Denny, 07-08-2004 20:57:33

After you heat the pipe around the pin try putting some ice on the pin for a few seconds, sometimes this will make the inner peice contract just enough to help. good luck

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markct

07-08-2004 20:02:12

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

a rosebud will put out alot more heat than most welding tips, however you need fullsize tanks not the little hobby tanks, acetylene is dissolved with acetone in the tanks, and acetalene tank can only release so much acetylene per minute, so a small tank wont be able to provide enough for a rosebud, unless its a real small one. my father and a friend were bending some big i beams once and had a rosebud tip that looked like a shower head almost, had to be about an inch and a half in dia, they had to hook two acetylene tanks together to get enough flow, oxygen was fine with one tank cause thats just a compressed gas, but the acetylene needed two tanks. a rosebud will definatly provide more heat tho so as long as you have full size tanks and you dont get too huge of a rosebud then you should be very pleased with the results, good luck, i know how frustrating rusted parts can be!

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JMS/MN

07-08-2004 19:59:31

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

They put out much more heat than the normal heating tip. Mills Fleet price for the rosebud matching their welder is in the low $30s. Rosebud for my small Smith welder was $53. Need to match your handle.

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Nathan

07-08-2004 19:23:55

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Re: Gas welding question in reply to Gordy MN, 07-08-2004 18:16:16

A rosebud puts out much more heat than a usual cutting tip. Not sure what size cutting tip you're using.

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Ben in KY

07-09-2004 07:47:51

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Re: Re: Gas welding question in reply to Nathan, 07-08-2004 19:23:55

Is a cutting tip being used or a welding tip ? I use a cutting tip for heating large stuff, just don't hit the cutting lever. Works for me.

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