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- From: kish@infiniti.watson.ibm.com (Bill Kish)
- Subject: Re: Oxy/Acet welding problems
- Sender: @watson.ibm.com
- Message-ID: <1993Jan26.210528.21920@watson.ibm.com>
- Date: Tue, 26 Jan 93 21:05:28 GMT
- Reply-To: kish@infiniti.watson.ibm.com (Bill Kish)
- References: <C1GsAw.7GE@dartvax.dartmouth.edu>
- Organization: IBM TJ Watson Research
- Lines: 52
-
- In article <C1GsAw.7GE@dartvax.dartmouth.edu>,
- Charles.K.Scott@dartmouth.edu (Charles K. Scott)
- writes:
-
- Text deleted...
-
- |> The welding I'm doing requires me to weld one piece to another at a 90
- |> degree angle. I have to bend a piece into a U shape and weld the U to
- |> a plate. I've discovered that welding into the angle isn't easy and I
- |> must be missing something in the set up.
-
- From your description, I'm guessing that your piece is going to look like
- this:
-
- ________
- U
-
- It's tough to weld at the U to the plate in part because the edge of the
- U will tend to get hotter faster than the center of the plate and the edge
- will tend to burn away... It's important to direct the heat in such a way
- that the U and the plate will reach the melting point at the same time.
-
- |> It appears to me that a lot of things have to come together to make a
- |> satisfactory weld. The books I've read on aircraft welding say that
- |> the rod is dipped into the puddle and kept there and the puddle and rod
- |> and tip are all moved down the area to be welded in one fluid motion.
- |> Easier said than done, I haven't achieved this ideal yet.
-
- When I weld, I heat the pieces to be joined to the melting point and then I
- introduce the rod just above the puddle... The rod heats up almost instantly
- and by moving the rod closer to the flame, I can cause a drop to fall
- off the
- rod into the puddle. Producing a bead consists of moving the torch in the
- direction of the bead and causing a series of these drops to fall off at
- regular intervals. The drop from the rod should flow right into the puddle
- and in the case of your 90 degree angle should form a nice fillet. I
- try not to
- let the rod touch the puddle since it tends to want to stay there!
-
- |> One of the problems, among the many, is that I have to use so much
- |> heat to get things molten that the hand holding the rod gets too hot
- |> and makes me jumpy.
- |>
-
- You might need to use more heat. If it takes a long time to form a puddle
- you wind up heating the entire work piece (causes warping too).
-
-
-
- Good Luck !
-
- Bill
-