types of welding defects?
441955
Undercut, inclusions and coldwells.
404191
go to a local welding shop and tell them what you need ...you just might want to take the thing to them so they can get an idea of what you are looking to get ... dont be cheap about it get your money's worth... you cant put a price on saftey
487926
poison? bleach? acid? ect...
557678
Ah ha.  Thermite.  Magnesium ribbon would be the usual method to start this reaction.\n\nBe careful with this reaction...
206203
I think it's these metals chrome, cobalt, titanium, or ceramic materials can be used.  I think they have recalled ceramic because they were cracking though.
177734
it could be that there are conflicts with the burner's drive, a loose cable or simply dirty lens.
250251
Cracks develop in Weld zones due to application of Excess heat & pressure at the joints. And also due to residual stresses which are induced during the process. Corrosion is also found more in Weld zones. These problems can be controlled by using a proper flux & stress reliving process (Heat Treatment) after welding.
832417
I am not a welder but I know how to,,,,,kinda. I do know that when you weld with a torch, it is called Brazing. There are a few different types of electrical welding too. MIG, TIG, and Stick. \n\nI hope someone else will help me on this, but MIG is when you have a gun that the electrode (wire off of a reel) comes out when you press the trigger, as well as turns on the electric to apply to the electrode so it sparks when you touch the metal that you want to weld that has been grounded. MIG welders often use Argon as a shielding gas while welding. It helps the weld form better.\n\nTIG welding, I don't know much about. I think TIG welding uses a different gun that shoots an electrical arc to the piece(s) you want to weld, and you melt the two pieces with the arc while adding fill metal with a metal rod.\n\nStick welding is done when you have a welder that looks like there are jumper cables sticking out. You put one on the pieces to weld, and hold a stick electrode in the other. You turn on the welder and press the electrode to the metal. The electrodes are often covered with flux. Flux is to help your welds form properly to be strong. \n\nI think that you hammer the welds when done to see if they had alot of holes in them, and too see if they were formed properly. Hammering will flake the impurities off of the top so you can see the weld.
1083199
Well that depends... are we talking MIG, TIG or some other modern welding technique?
135823
The three types of welding are 1. Electrode welding, which uses a coated metal filler rod to add metal to the weld puddle; the welding job determines the setting of welder amperage and the type and size of electrode used 2. MIG welding (Metal Inert Gas), also known as wire-feed welding, which is a semi-automatic process and the easiest of the three to learn; it uses an inert gas for shielding 3. TIG welding (Tungsten Inert Gas), also known as heliarc welding, which uses a tungsten electrode shielded by inert gas. TIG is slower than MIG and is more precise, which is why it is used for thinner and more exotic metals.
596009
Your question confuses me.  An electrode is ofetn called the "rod".  There are different types:  6010, 7018, Low-hydrogen are the most common.  Then there are tungsten electrodes.  This site lists the types of rods.  http://www.metalwebnews.com/howto/weldrod.html\n\n"give you the classification him/herself"  you mean get certified?  getting certified has to be done in person by taking a test
909325
I don't think they do that with welding oxygen cylinders. Doesn't make any sense to me.
311283
http://www.corrosion-doctors.org/Forms/embrittlement.htm
315423
all welding uses a heat source to melt the parent metal, parent metal is the metal you are trying to weld.\nWhen the metal melts, it can absorb gas from the air. This is not good, oxygen causes corrosion and hydrogen creates bubbles is the metal which weakens it. So when you weld you need to doo something to keep these gases out.\nOxy-acetalence or oxy-l.p.g. welding uses a gas flame to melt the paretn metal. The ratio of oxygen to acetalene or l.p.g. is critical for burning cleanly and not get oxygen in to the weld. Additional metal is applied by a filler wire, dipped in manually by the person welding.\n\nM.I.G. and T.I.G. use an inert gas (the I.G. in their name) to keep the other gases out.\n\nStick welders (manual metal arc) uses the flux around the welding rod to create a suitable atmosphere around the weld pool.\n\nmig, tig and arc use an electric current to melt the parent metal\n\nwith mig, the machine feeds extra metal in to the weld the whole time.\n\nwith arc the welding rod supplies extra metal\n\nwith tig the operator adds filler wire manually as required.\n\nTig does the nicest welds but it the most expensive as it is slow.
308446
http://www.lasers.org.uk/laser_welding/briefhistory.htm\nhttp://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=HPID,HPID:2005-17,HPID:en&q=history+of+lasers
419109
I don't remember the ordering, but there's probably some metal out there that won't react?  Gold, maybe?  For regular metal, that sounds a bit iffy.
237301
Welding on galvanized metal can be dangerous.  The best bet is supplied air.  This would be preferable over any filter. Always make sure there is good ventilation, too.