Welding Tutorial: Different types of arc welding

Welding Tutorial: Different types of arc welding


Hi everyone, I know it been awhile since I
upload my last video and that’s because i moved to Edinburgh and I studying different course and I am no longer doing Offshore Engineering and I’m doing my master in Heriot-Watt on mechanical engineering now so it’s actually quite different! It takes me some time to adjust myself too. I probably do another video and talking about my
degree in two different university, what is it like the good and the bad of it just comment if you’re interested to let me know so enough on the life update. Today, we
gonna talk about different type of arc welding so there are four common type of arc welding which is SMAW, GTAW GMAW and SAW. They sound quite similiar right now but it will be clear later on. Starting with the SMAW which commonly just called stick welding. As you can see from the pictures the arc is the electrode, is actually like a rod and it covered by flux which give the shielding. so this avoid oxidation and contamination to the weld it is also a spray here… a spray of metal transfer
to the joint and this is actually quite important as it’s directly determine the amount of spatter that generated. In general, arc welding had been created by the current flow so the work clamp, the work clamp have to be connect to the work piece in order to get a complete circuit. so i put this picture in here if you are Chinese, you probably see this a lot in the temple, and i think the theory on stick welding is similar to this, but i dont know what is this called in English so you tell me! it is for the God, when it burn, it gives these smoke i think is kind of like shielded gas, shielding gas, and leave these flux all over the place ok and it is also like covered by the flux, cover on the rod. ok moving on to the electrode the American Welding Society, AWS have a standard for all the electrode so the letter E, stand for electrode That’s obvious and 60, the number of 60
stand for 60,000 psi tensile strength per deposited weld metal. and the second last digit indicate the welding position suitable for use so one means all position and the last
digit, it is something to do with sheilding indicate the covering type and current type so the greater the number, the better the sheilding ok so next is GTAW, I will just called it tungsten or TIG when people ask me what welding technique i want to use, ok, so the electrode is made by tungsten so it is not consumable, it is not consumable ok! it required Argon or Helium mixture of shielding, shielding gas, see the cylinder here it can operate with or without the filler metal it depends on the thickness, so if it is thin, you no need the filler metal if it is thinker then you need the filler metal ok and and it can be remote control, it can be remote control as well this is just more pictures now move on to GMAW, or called MIG or TIG oh… no MIG OR MAG! it is the most adaptive method for offshore welding due to its efficiency and productivity ok as you can see from the picture
is like a gun holding by the welder it can be automatic as well okay, the arc is, the arc is in a wire form, and its fed automatically, okay? so it used Argon, Helium, or CO2 or gas mixtures as shielded gas see the cylinder here! its the same as TIG the different is there is a wire feeder because it is consumable! now, getting on to the more complicated part. I was also thinking to do a separate video on just GMAW so i can talk about in more details, just in a few week time so bear with me. okay, there are 3 ways of metal transfer in GMAW so the first one is short circuit, it has low
heat input and globular and axial spray have higher, higher input. And for globular is hard to control the droplets size and for axial, its easier but its
restricted to flat horizontal position as the technology to improve on axial spray, there’s this thing called pulse spray transfer. it is more suitable for wide range of base metal thickness as you can see from the table here. So for the wire fed, there is a AWS standard and also a corresponded product name to it. um here is the example of product selection guide from Lincoln you can find it on the Internet but i will also put the link down below so you can check it out yourself ok getting to the last one which is Submerged. From the name, you know that the arc and the molten metal are covered under layer of powder which also the flux. it prevents the sparks, the spatter, intensive UV radiation and fumes the flux act as a thermal insulator, allow deep penetration of heat, it is restricted to flat horizontal position due to the powder. So it is not
very suitable for offshore use. however, the welding of the circular pipe can be done by rotating the electrode and flux fed as you can see from the picture, similar to MIG, the SAW use consumable electrode wire fed as well the range between 1.5 to 10 mm diameter the unfused powder can be recovered, treated and refused again. it is high speed, productivity and high quality welds so it is definitely a good choice in the workshop for example shipbuilding or pressure vessel manufacturing. As you can see from the picture here the equipment is more complex than
other welding technique So… That’s it! We done for today! Thank you very much for listening.=) any questions just comment below and I’ll be replying you. See you and bye=)

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