I need some technical information regarding to narrow gap GMAW welding.Especially lack of fusion defect.?
81481
Hard to say without a picture or to see the process. Gas pressure? Wind? Contaminants in the metal? Wrong gas mixture?\nHere's a couple of links that may help..
406320
most underwater welding is a patch type repair..you use electric arc welding but it cools too quickly and is not as strong as a surface weld. i attended "the ocean corpation"\ncommerical diving school in houston in 1976. underwater cutting is much easier...experience is the best teacher. all these schools do is acquait you will enough info to keep you alive until you learn...
1173860
http://www.oz.net/~coilgun/theory/solenoidphysics.htm
1069019
A lot of the answers here are assuming that the power is in overhead cables. He clarly said that the question is from the UK and the majority of the UK rail network is powered by the third rail not overhead cables.\n\nAs to answer the question it might melt but not spot weld in the traditional sense. Although I'm sure it would probably trip something somewhere before it's too melted
907314
Reference to the Freedman article on Light Brigade is below.  I couldn't find any with the other title or author.  The laser technology have been in development for years.  The second reference is to organic light emitting devices.  Perhaps that is related to what you are talking about.  But until you say something about what fate of what new magnets, I can't directly address your question.\n\nTechnologies this promising usually make it into production unless they hit some technical or financial roadblock, or something better comes along first.
17626
If you are thinking about welding ... forget it! Cast iron does not weld. A highly skilled person can braze cast iron together but the high heat can distort the iron and can be expensive. And you still have the appearance of the raised braze bead to deal with if it is on an outside surface.\n\nI recommend "gluing" cast iron together. A good product to use is called J-B Weld. It is a two part epoxy adhesive that comes in small squeeze tubes. Follow directions on the package. This stuff does not make a good filler material because it is somewhat runny before it sets up.
709868
http://www.welding.com/technical_welding_tips.shtml
430657
Need to learn to weld.  I'd say go buy one for the $700-$800.
812363
In Oxford a fusion reactor has been going for many years with a large amount of energy being made. Unfortunately to keep the plasma contained the largest magnetic field generated anywhere has to be maintained and to reach the enormous temperature needed to initiate fusion requires more than ten times the energy extracted. The problems are technical construction rather than theory and with the new international initiative the scientists are confident that a viable fusion reactor can be made in a few decades.
1057816
Uhh, Yeah. Wear the shades man. goggles are good enough for gas ax.\nArc welding is done with a hood because it will even burn your skin!
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
1127249
Have you called Kiamichi Tech Center there yet?  They have welding classes.  Tulsa has a very good Welding school as well as OKC and Norman.  I am pretty sure Tulsa Welding School can get you certified if need be though.
620886
(m)\n\ngoto the following website for your question with neat diagrams\n\nhttp://hyperphysics.phy-astr.gsu.edu/HBASE/electric/gaulaw.html
618928
Virtually all steels are quite weldable.  Those alloys with high percentages of certain metals like chromium must be welded in an inert atmosphere to prevent oxidation of the alloying metals.
721125
fusion is when two elementary particles collide and combine or fuse to make -- even temporarily -- a new particle. In the graphic below, a form of the hydrogen nucleus -- Tritium -- collides with another form of the hydrogen nucleus -- Deuterium -- to form a new particle. (Deuterium and Tritium are isotopes of hydrogen -- a form of water.) The fused particle is not stable, and quickly decays via the split decay mode into a neutron -- moving very fast, i.e., "hot" -- and a helium neucleus -- also know as an "alpha" particle and energy.\nThe radioactive by-products from fission are undeniably bad. They last for tens of thousands of years and can cause untold problems, the worst of which is through terrosists using the waste products for weapons. The fast neutron from fusion can potentially interact with metals a cause them to become radioactive. This process can be minimized by have neutron shielding between the fusion burn and any metals in the reactor. However, the radioactive metals produced -- and any ash from the fusion burn itself -- is a low-level radioactivity that is not considered dangerous, with half-lives in the tens of years. There is no comparison -- radioactive waste from fission is very dangerous, radioactive waste from fusion is not very dangerous.\nIt is hard for most people to understand where this energy comes from, and how much it is. Most people have heard of Einstein's famous equation:\n\nE = mc2\n\nWhen the fusion reactions listed above occur, a small amount of mass disappears. The small amount of mass is converted into a large amount of energy. How much is large? A typical chemical reaction in which hydrogen and oxygen combine to produce water, releases about 1 eV of energy. The fusion process typically releases 1,000,000 times as much energy. Historically, when people talk about the benefits of nuclear fusion, they refer to how much fuel must be burned to equal to each other.\nNuclear fusion takes water, burns it, releases helium (and a small amount of radiation in the form of neutrons), and converts the missing mass into massive amounts of energy.
420568
look on yahoo or google for grupo celsa steel manufacturers , and send them an e-mail(sales)they will send you the information you want , as they make all those products, but you have to ask , the only cold rolled coils they do are contistretch coils which are compact but the only other coils they roll ar hot and are called wild coils, both differ in price . The H beam is actually called RSJ (rolled steel joist) and sections.
8554
Well stillerfanz,\nAs an ex welder/HVAC tech and now an Inspector, I don't trust the Victaulic. Even though you groove properly and torque per procedure I would say:\n1) Victaulic quick, easy, and cheap Install or Fix.\nQuick if future change or repair needed,\nBelieve continuous torque should be rechecked because of machinery vibrations. \nMight lose the competitive edge because of rework. Leaks always possible.\n2) Weld more permanent and stable in regard to environment and conditions.\nDoesn't need continuous Inspection. \nLeaks unlikely\nHarder to perform change or rework.\nRegardless, both should recieve Base Line Inspection and Periodic Review.\nI am assuming you mean strictly Commercial/Industrial Installations.