what is the purpose of flux in welding, soldering and brazing?
441850
In soldering of metals, flux serves a threefold purpose: \n\nremoves oxidation from the surfaces to be soldered \n\nseals out air thus preventing further oxidation\n\nfacilitating amalgamation improves wetting characteristics of the liquid solder.
1043620
A welding fixture is a jig to hold the parts being welded. The design depends on what you are welding. Finishing the work properly requires operator skill because hot welds can distort the piece and pull it out of shape. A welding fixture can be as simple as some guide pieces tack-welded to the table...whatever you need to get the job done.\nSimple fixtures...\nhttp://www.vansantent.com/magnetic_welding_fixtures.htm\nUniversal workstations...\nhttp://www.bluco.com/welding/systemsizes/index.html\nFixtures for automated welding...\nhttp://www.premiertool.com/id74.htm
636584
"Many metals, such as copper, bronze, silver, brass, and some steels, readily react with solder to form strong chemical and physical bonds. Other metals, such as aluminum, high alloy steels, cast iron, and titanium, range from very difficult to impossible to solder."\n\n"Soldering Hints\nA useful *anti-flux* is ordinary toothpaste."
1060369
Arc welding electrodes are identified using the A.W.S, (American Welding Society) numbering system and are made in sizes from 1/16 to 5/16 . An example would be a welding rod identified as an 1/8" E6011 electrode. \nThe electrode is 1/8" in diameter \n\nThe "E" stands for arc welding electrode. \n\nNext will be either a 4 or 5 digit number stamped on the electrode. The first two numbers of a 4 digit number and the first 3 digits of a 5 digit number indicate the minimum tensile strength (in thousands of pounds per square inch) of the weld that the rod will produce, stress relieved. Examples would be as follows: \n\nE60xx would have a tensile strength of 60,000 psi E110XX would be 110,000 psi \n\nThe next to last digit indicates the position the electrode can be used in. \n\nEXX1X is for use in all positions \nEXX2X is for use in flat and horizontal positions \nEXX3X is for flat welding\nThe last two digits together, indicate the type of coating on the electrode and the welding current the electrode can be used with. Such as DC straight, (DC -) DC reverse (DC+) or A.C.\n\n\nWelding Electrodes are wires or rods of metals or their alloys which are mainly used in welding. The primary purpose of using an electrode in welding is to maintain the arc needed for welding as well as supply the filler material at the point where the welding is done. It actually serves as a conductor for the current required to form the welding arc. The electrode may be consumed during the welding operation or may be just acting as a conductor. The metal electrode is mostly used as a cathode in direct current welding, whereas in alternating current welding the electrode is neither a cathode nor an anode.\n\n\n\nWelding Process \n\n\nA welding arc is created between the two metal pieces to be welded, using an electric power supply which can be either DC or AC. The power supply is so high that the arc created by it can melt the metal parts which form a part of the arc. If the electrode is the filler type, the arc created between the electrode and the base metal melts the electrode. The molten electrode serves at the filler material, enduring additional bondage between the welded parts. Additional filler materials and flux are used along with the electrodes to provide enhanced properties of the weld. Sometimes, even a special environment of a shielding gas is also provided to enhance the welding process.\n\n\n\nTypes of Welding Electrodes \n\n\nFactors which influence the classification of  welding electrodes are\n\n\n        Consumed electrode\n\n        Non-consumed electrode
377534
errr, grind metals to a fine powder and mix them together and press them and you can get alloys physically impossible to make by forging.\n\numm, grind metal very fine so the oxidise and use them to make metal fires, such as "thermalite" for welding traintracks.
169774
I use a torch with MAPP guess whenever I solder copper pipes.  For welding iron, I use a MIG or arc welder.
1157570
Welding rods are usually sold in air tight containers. Once they are open, the coating will tend to absorb moisture. Any procedure that will exclude atomspheric moisture is okay. \n\nI have seen jobs where they used an old refrigerator with a couple of 100 watts light bulbs inside to maintain some warmth.
1002721
Friction stir welding.\n\nhttp://www.azom.com/details.asp?ArticleID=1170
362491
A transformer style welding machine converts the high voltage and low current electricity from the utility into a high current and low voltage, typically between 17 to 45 volts and 190 to 590 amps. This type of machine typically allows the welder to select the output current by either moving the core of the transformer in and out of the magnetic field or by allowing the welder to select from a set of taps on the transformer. These machines are typically the least expensive to purchase for hobbyist use.
468469
that's a very challenging question, it is possible to produce strings of iron atoms a few nm across, but at that size they would obviously lose the properties of stainless steel, the resulting question would be, how small can wire be produced and still be considered to be of a certain alloy?  (this discussion refers to high precision lab production, not industrial production)
7409
Hi my freund.\nTIG is one of the method of fusion arc welding which its exat name is GTAW(Gas Tungestan Arc Welding)and contain a tungestune electrode and some sheilding gas such as Argon and Helium .\nI dont know how much information do you want.If you need more you cam mail to me by this address:\nmostafahedayati@yahoo.com to answer more accurately.\nGood luck
679356
It is designed as a deep penetrating mild steel electrode that can weld in all positions with AC or DC. Because of its ability to cut and fill it is also used as a utility electrode and can weld through rust, paint etc.
1073472
Its dam.  It refers to a small dam of solder that a tinker would put in a sink to hold back water while he fixed the lower parts or pipe.  Then it would be broken out.  It had no leftover value, and thus was worthless, as is something that "is not worth a tinker's dam."
896366
tack welding is a small application of weld metal.  it can be used in two ways.  One is in places where the loads are small so not much weld is required.  But it is usually utilized to hold two pieces relative to each other.  it still allows moving the pieces by striking with a hammer for minor adjustments.  Once the pieces are in place to the satisfaction of the welder and quality control inspector, the real weld is applied.  Many time once the permanent weld is started, the tack weld is ground off.
1083199
Well that depends... are we talking MIG, TIG or some other modern welding technique?
1176756
Time, temparature, and pressure are required to weld metals or polymers together.  Ultrasonic vibration is used as the heat source. Combined with pressure and a little time, it causes the molecules to integrate together resulting in a welded part.
116761
Passivation accomplishes two things.  First, it removes any stray particles of mild steel that may be present on the surface of the stainless steel.  Second, it builds a protective layer of corrosion on the surface of the stainless steel by slightly corroding the stainless steel itself.  \n\nThis process is desirable when the steel will be subjected to harsh environments, such as submersion or heavy exposure to seawater.