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Torch Welding
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Here are some more information for Torch Welding:
Learning how to weld aluminum can be tricky depending on the process used and the thickness of the aluminum. There are three basic methods to weld aluminum; they are gas, mig and tig welding.
How to gas weld aluminum.
This type of welding is not common but will be found in several maintenance industries such as refrigeration repairs. Generally it involves fusing very thin aluminum sheets using oxy acetylene equipment.
Aluminum by nature is difficult to determine the point as to where the metal will actually melt. Consequently trying to heat two parts of aluminum to join them can result in the metal simply 'dropping out' when the melting point is reached. Oxy acetylene welding aluminum therefore is a process that really can only be achieved through practice until instinctive knowledge lets the operator know when the material is close to melting point and when filler can be introduced.
How to weld alloys using a Mig Machine.
This is the easy way and most common way to weld aluminum. Mig welding uses a continuous wire feed of aluminum wire applied to the weld area. Mig welding aluminium allows welding of 1mm thick metal and upwards. Depending on the power of the Mig machine. Thinner aluminum may need to be spot welded to avoid blowing through, again this depends on the thickness of the wire electrode being used, the smaller gauge wire used the thinner the metal you can work on.
Sheet metals are mostly welded using mig welders; common use is in aluminum boat construction, gates, fences and light structural and architectural work.
Welding aluminum in heavy gauges is similar to that of welding steel. You will need to change the welding cable liner to one made of Teflon that will allow smooth running of the filler wire. Aluminum wire is far weaker than steel and requires less friction through the cable and gun. Also you will need to use pure argon gas as opposed to cO2 used in steel welding migs.
Welding alloy using a Tig welder.
Tig welding aluminum is also difficult and requires plenty of practice. Similar in a way to gas welding it consists of heating the metal to melting point using a tig welding torch and introducing a filler rod at the right moment to create the welding bead. learning how to weld aluminum using a Tig machine is the most satisfying as the finished job is a work of art. It requires a fair amount of skill and allows a finished weld to be as small as 1/16 inch wide.
Joel Davis has been a welder for 25 years and is the webmaster at WeldingHowTo.com where you can find aluminum welding tips and how to weld aluminum techniques
Gas Welding "101" - Details to Help You Become a Successful Gas Welder
Gas Welding is alive and well!
* If you want to create artistic projects, many people will choose gas welding exclusively.
* At some point, most arc welders will want to, or NEED to use gas welding. I'll help you get started. Then YOU need lots of practice!
Seriously, practice is CRITICAL for running great beads.
* If you're doing artistic stuff, you'll want it to LOOK great.
* Eye-hand coordination gets tougher because you're doing more multi-tasking then arc welding.
Being able to DIRECTLY be shown details about how to do special jobs like gas welding is the BEST way to get started. (By WATCHING some else gas weld).
Here's the "scoop" for this article:
1) I'll give you a brief introduction to the gas welding world...
2) Then I'll hit on some safety tips...
3) Next the equipment itself...
4) Getting started:
* The flame.
* Adjustments.
* Angles.
5) Filler rod, tacking, the puddle, problem solving.
6) Brazing Tips.
INTRO:
* Gas welding in this page refers to oxygen-acetylene welding of metals.
* Your are actually WELDING two pieces of metal together, wheras brazing doesn't melt the parent material, just the material used to join the pieces.
* The torch itself needs to be able to melt the metals being used: filler rod, & "parent metals".
* Having an oxygen-acetylene torch around enables you to not only WELD, but also to cut the materials, heat & bend materials, & loosen tight-fitting materials via heating.
* Safety is paramount! You are working with extremely hot & potentially explosive materials!
SAFETY STUFF:
SERIOUSLY gas welding can really be fun, interesting, & profitable!
BUT:
* The tuned gas flame can exceed 6,000 F.
* Un-protected eyes can be fatigued & permanently harmed in a short time.
* The acetylene tank could explode under certain conditions: dropping, in a fire, from an arc or torch flame penetrating the casing, etc.
* The oxygen tank starts with 2000 PSI & can literally go like a rocket if the top valve assembly breaks off.
* Hitting something already burning with the high pressure torch valve can really accelerate the fire.
So, be careful!
GETTING STARTED:
The Flame:
* Set the gas and oxygen pressures MUCH lower than for cutting.
* Some gas setting charts call for the 02 & gas pressures to be the same as the tip size being used: tip size 1 = 1 PSI for gas & O2.
* Tip size 5 = 5 PSI for gas & O2, etc.
* I simplify things even farther! I just set both pressures at 10 PSI then crack the valves open at the torch handle to where I need them to be. Just start EASY & work them up to the capabilities of the tip. (or just do it as above).
* Also, tip sizes vary for the size metal being welded: Tip size 1 = 1/16" metal and tip size 5 = 1/4" as examples.
* It really isn't hard to figure out if the tip your using is too small or too big for the job. (Too small won't get everything hot enough, & too large will tend to blow everything away).
* Crack open the gas & light it right away.
* Crank up the gas till it separates from the tip then back it off.
* Hit the O2 until the blue flame first gets short & bright. This is a "neutral flame", used for most jobs.
Note that the torch tip & the filler rod should be about at a 45 degree angle.
*Too steep can make the penetration too deep & not pre-heat / too shallow can cause too little penetration.
Let's do it:
* Starting out, it can give you good practice to just put the flame on metal without a filler rod. This helps you get used to the process without worrying about the filler rod too.
* Heat the metal till there's a puddle, then begin moving the flame to create a bead.
* Get the blue part of the flame nearly touching the metal.
* Move in a circular or semi-circular fashion to make it into a bead.
* Aim the flame in the direction you're trying to make the bead. (forehand welding).
* Don't get ahead of the bead or it can make it not hot enough at the puddle.
* Do this for a few times before using a filler rod.
Introduce a filler rod: (usually the same diameter as the pieces that are being welded).
* start the same way as above and keep the rod at a 45 degree angle also.
* Dip the rod in the puddle frequently, but try not to heat the rod with the flame. (heat the puddle, not the rod).
* Practice running straight beads then work up to following curved paths. (some schools have you write your name with a gas welding bead).
THEN PRACTICE till you can run decent looking beads.
Note that you should be tacking pieces together at least at both ends of where you're welding, to prevent moving of the gap.
Problem solving:
* Your flame is fluctuating: gas pressure or supply may be low.
* Popping sound: Hot tip, plugged tip, pressure too high.
* Flame stops: 02 pressure high.
* Whistling noise & the flame backs up into the torch: (backfire), 02 or gas too low, the tip is clogged or dirty, or the tip touched the puddle.
BRAZING:
* Many things are similar about gas welding and brazing: but remember that with brazing you aren't melting the parent metal, just the brazing material (such as brass).
* The brass and the parent metal MUST be clean and hot enough for there to be a good joint. (Use flux! In a can, or coated rods).
* Think of soldering, if you don't get everything hot enough, it might come apart (or not be a good electrical connection).
Now GET BUSY PRACTICING!
This was a just a BRIEF description of the gas welding process.
Good luck to all you ladies & gents!
About the Author
I started working as a Journey-level welder for Weyerheauser Timber Company more than 20 years ago. That was the same year that I became a certified welder in Washington State.
I weld today because it's cool & interesting! If you can DREAM it, you can probably WELD it!
My website: http://www.arc-welding-and-beyond.com
The purpose of my website is to educate the beginning welder in ALL RELATED skill areas of welding: running great beads, designing, preparing, layout, finishing, & troubleshooting problems.
"Welding is more than just running beads!"
can you blow glass with an oxy-acetylene torch?
I have an oxy-acetylene welding torch and was wondering if it can be used to blow boro glass? Anybody used it before?
There are two kinds of glassblowng: at the torch and at the furnace. Torch or flame working includes scientific, neon, and artistic working. It may be done witth soft glass (melts around 1800F) or borosilicate (melts around 2200F). The former requires more careful handling and annealing but until recently the latter had few colors.
While an oxy-acetyl torch can be used to try things out, but it is too hot and too small for real work. The former means that it tends to boil the glass and burn off colors. If you manage to spread it out, it tends to put a dark tone in the glass which looks ugly.
Soft glass torch working on a small scale can be done with a propane or MAPP braising torch (like the Hot Head), but larger pieces and borosilicate are down with oxy-propane torches of which many are available from just over $100 to over $300. Tanks and regulators add several hundred to that.
www.arrowsprings.com
http://users.ticnet.com/mikefirth/what-can.htm
Welding sparks caused fatal muffler shop explosion
Westmont police at the scene of an explosion at Midas Muffler at 401 W. Ogden. (Scott Strazzante/ChicagoTribune) A worker was killed this morning in an explosion at a Midas Muffler shop in west suburban Westmont, according to fire officials there.
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