Tom_ Posted December 18, 2008 Report Share Posted December 18, 2008 Sorry if this isnt quite topic worthy but im fairly desperate. Currently doing an assignment due in tommorow (typical last minute style) its about welding processes. Iv covered MIG and TIG (its only the basics of how it works eg. how the arc is formed via short circuit between the positive electrode and the negative work piece.) However I have to cover 3 more processes. Im currently on MMA (or stick) and despite having the wonders of google and wikipedia here, its fairly hard to work out how it works having no experience with it first hand.If anyone could enlighten me on the subject (and maybe 2 other forms of electric arc welding) then they would recieve my love forever. Either in this thread or on MSN at tom_m132@hotmail.comcheers. Quote Link to comment Share on other sites More sharing options...
basher Posted December 18, 2008 Report Share Posted December 18, 2008 (edited) Stick welding is pretty basic...Heat the filler rod, let it melt over the join..In it's most basic form. Quite similar to Oxy-cetylene welding..not really as oxy-acetylene welding is more brazing, mma actually metals the metal like mig and tig and then a metal is added. oxy-cetylene just melts the filler rod to join them.the stick is the electrode in mma and the current is passed through this to strike the arc, it can use either ac or dc depending on metal. the electrode is coated in flux and is also what is filled into the weld like you would with a filler rode in tig. as the arc is struk the flux vapourises and creates a gas shield to protect the weld. Also as you weld the electrode gets shorter and shorter as it fills the weld. Edited December 18, 2008 by basher Quote Link to comment Share on other sites More sharing options...
Tom_ Posted December 18, 2008 Author Report Share Posted December 18, 2008 (edited) Yea, lol I was just being a retard/reading a very bad explanation. + charged consumable rod with chemical coating, touched on - workpiece, short circuit, melts, coating forms protective gas/slag. Bam.2 other forms that are relativly easy to explain anyone? Edited December 18, 2008 by Tom_ Quote Link to comment Share on other sites More sharing options...
ZeroMatt Posted December 18, 2008 Report Share Posted December 18, 2008 I'm sure wikipedia would cover it in enough detail for what you are doing Quote Link to comment Share on other sites More sharing options...
Tom_ Posted December 18, 2008 Author Report Share Posted December 18, 2008 Yea, yea I was just being a total retard and missed a very basic break down of it on wikipedia.Now I need two more forms of electric arc welding to explain... Quote Link to comment Share on other sites More sharing options...
the_soon_to_be Posted December 18, 2008 Report Share Posted December 18, 2008 Stick welding is pretty basic...Heat the filler rod, let it melt over the join..In it's most basic form. Quite similar to Oxy-cetylene welding..that not MMA (stick) welding, you are talkng about bracing.mma can be done either in AC or DC, unlike any other than TIG for ali. you can reverse the path of the current, i.e the arc going for the earth'd job to the stick or the stick going to the earth, this change is quite substantional.it is essectially a metalic rod covered with a flux, meaning no need for an inert gas to form a shroud. this is why all outdoor welding is MMA : ship building building erection etc.rule of thumb is the size of the rod will produce a weld throat joint 1 mm larger than it, thus a 4.0mm rod will produce a miniu, of a 5mm weld etcunlike MIG and TIG the positioning of the earth is critical, the quality of the eletrical earthign is effected by the distande the earth is away from the job, uhnlike MIG and TIG you are left with bi product, namely slag, which has to be chipped off, although the sign of a good weld is the slag should be curling off aprox 10mm behind the elctrodeask anything else, i build pressure tested vessles for oil rigs etc Quote Link to comment Share on other sites More sharing options...
basher Posted December 18, 2008 Report Share Posted December 18, 2008 spot welding? laser welding? not sure on its name but theres a process that is spot welding but it uses rollers and is used to do the edges of radiators for example Quote Link to comment Share on other sites More sharing options...
Tom_ Posted December 18, 2008 Author Report Share Posted December 18, 2008 StuffWhey, thanks man thats been really helpful (bits about the industrys, AC DC alu stuff) said sweet FA about that on wikipedia. Quote Link to comment Share on other sites More sharing options...
craigjames Posted December 18, 2008 Report Share Posted December 18, 2008 friction welding where one section the workpeice is held still, the other is put in the chuck end of a specialist lathe type machine, the two pieces are brought together, the heat generated from the piece spinning causing friction, heats the two pieces and the pressure from the two pieces being brought together causes them to bond. pretty much it. and resistance welding (spot welding) current from two opposing electrodes, runs through the workpeices, the resistance from the work pieces on the current causes a heat build up and creates fusion between the two pieces Quote Link to comment Share on other sites More sharing options...
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