Welding question: joining an inner sleeve

Michael Horowitz wrote in
:

On Sun, 23 Sep 2007 11:16:50 +0000 (UTC), Fortunat1 wrote:


Yeah, I've been learning those as well. I found that the rod is a
great help here. when the metal underneath starts to go I start adding
rod to the edge of the hole going around the edge and voila! some of
them even look like rosettes.

Have you worked with heat sinks? Try this: get a heavy steel washer
with a 3/8" hole. Drill an 1/8" hole in a piece of sheet and lay it
over another sheet - you're forming a flat version of the same thing
you do in preparation of a rosette weld. Now center the washer on the
1/8" hole. The heavy washer will wick away a lot of heat and reduce
the amount the upper sheet burns back. The equivalent for tubing would
be 'chill bars', which I'm thing of trying, but also thinking that's
going over-board - MIke


Haen't really tried them yet. None of the info I have mentions them so I
hadn't really thought of it. What I have doen is not cut off ends of tubes
and what not until I've welded them up in order not to blow edges away,
which kind of amounts to the same thing, but I'm going to try it..

On Sun, 23 Sep 2007 23:43:57 +0000 (UTC), Fortunat1 wrote:




Haen't really tried them yet. None of the info I have mentions them so I
hadn't really thought of it. What I have doen is not cut off ends of tubes
and what not until I've welded them up in order not to blow edges away,
which kind of amounts to the same thing, but I'm going to try it..

For the ends of tubes I've heard that inserting a large diameter bolt
into the tube end will act as a heatsing and wick away heat; however,
not burning off the end of the tube or the end of any weld is an art
that is used over and over, so it's probably something to work on. I'm
at the point when coming to an edge that I say to myself "Ok, you know
what happens here, pull the torch away" Sometimes I even get it right!
But then again, filler rod covers a multitude of sins - Mike

Michael Horowitz wrote:
On Sun, 23 Sep 2007 23:43:57 +0000 (UTC), Fortunat1 wrote:



Haen't really tried them yet. None of the info I have mentions them so I
hadn't really thought of it. What I have doen is not cut off ends of tubes
and what not until I've welded them up in order not to blow edges away,
which kind of amounts to the same thing, but I'm going to try it..

For the ends of tubes I've heard that inserting a large diameter bolt
into the tube end will act as a heatsing and wick away heat; however,
not burning off the end of the tube or the end of any weld is an art
that is used over and over, so it's probably something to work on. I'm
at the point when coming to an edge that I say to myself "Ok, you know
what happens here, pull the torch away" Sometimes I even get it right!
But then again, filler rod covers a multitude of sins - Mike


When you get close the edge that's going to burn away stop and let the
piece cool off then go back and finish it quickly.

John

"Michael Horowitz" wrote

For the ends of tubes I've heard that inserting a large diameter bolt
into the tube end will act as a heatsing and wick away heat; however,
not burning off the end of the tube or the end of any weld is an art
that is used over and over, so it's probably something to work on.

[[[[[[ BINGO ! ! ! ! ! WE HAVE A WINNER ! ! ! ]]]]]]]] GGG

Really, in all seriousness, that is the wisest thing anyone has said in this
whole thread.

Gas welding thin tube is an art, and the art should be practiced until
perfected, for perfection's sake.

So, if you are burning away things you do not want to burn away, keep
working on it until you get it right.

Another tip, is to use the rod to carry away heat. In cases where you are
having to be careful not to burn something away, the heat should be cool
enough that the rod is not in the puddle all of the time (while you are
waiting for the small (being patient) flame to heat up an area), so while it
is not[in the puddle], pull it away far enough that it will cool. Then,
when an edge is in danger, stick the rod against it to help cool it. Even
when the rod is almost constantly in the puddle, it can still be used to
control heat in different parts of the puddle. A lot of heat energy is
sucked up in making the steel go from a solid to a liquid. Use that fact,
to cool where it is getting too hot.

I'm
at the point when coming to an edge that I say to myself "Ok, you know
what happens here, pull the torch away" Sometimes I even get it right!

Learning patience. Good! You can't rush this thing, that is for sure.

But then again, filler rod covers a multitude of sins.

Bad attitude! ;-) Be a perfectionist, as much as possible. The fine line
is knowing when a little more rod to cover is a mistake is an OK thing to
do. I am hard on myself, because if I am my worst critic, my work will look
good to anyone else.
--
Jim in NC