1 00:00:09,420 --> 00:00:13,489 Hi, welcome to another video from Grimsby Institute. I'm Joe Broddle , one 2 00:00:13,590 --> 00:00:17,029 of the welding tutors here. And in this introduction video, we're going to show 3 00:00:17,129 --> 00:00:22,619 you the basics of MIG/MAG welding. The difference between MIG and MAG, MIG 4 00:00:22,719 --> 00:00:28,159 is metal inert gas, MAG, metal active gas. So it all depend on the gas you are using. 5 00:00:28,260 --> 00:00:35,000 MIG is very popular for using on aluminium with inert gas, possibly an Argon and MAG 6 00:00:35,099 --> 00:00:40,040 used on a range of other materials and the gas is normally a mixture between argon 7 00:00:40,139 --> 00:00:46,159 and CO2. So the actual process itself, it uses a continuous feed. It's a very, 8 00:00:46,259 --> 00:00:52,190 very versatile process, welding positions you can do them all. You can go up, down, 9 00:00:52,290 --> 00:00:55,580 left, right. All depends on, again, the integrity of the wled that you're looking 10 00:00:55,680 --> 00:00:59,300 for or the look of the weld that you're looking for. So as the wire is fed 11 00:00:59,400 --> 00:01:04,520 through, you pull the trigger and it comes out through the gun. As a shielding gas, 12 00:01:04,620 --> 00:01:07,760 which we've just spoken about as well, which helps to protect the well from any 13 00:01:07,860 --> 00:01:14,970 contaminants in the air. MIG/MAG wleding became popular in 1952 in the UK 14 00:01:15,989 --> 00:01:26,319 and the wire itself comes boxed, like this and on the box itself, it would tell 15 00:01:26,419 --> 00:01:30,700 you what polarity to use it at what position it can be used at and ideally 16 00:01:30,800 --> 00:01:39,379 what volts to use as well. Unpacking a box, the wire will look something like 17 00:01:40,309 --> 00:01:45,279 this, and I'll show you later on what actually looks like in the machine itself. 18 00:01:48,080 --> 00:01:52,510 Basic tools and equipment to use for MAG welding, I've got my tongs, I've got 19 00:01:52,610 --> 00:01:58,060 a wire brush and I've got a file as well, just to, if needed to help bend the toes 20 00:01:58,160 --> 00:02:03,160 of the welding. PPE-wise, flame retardant overalls, steel toe-capped boots, 21 00:02:03,260 --> 00:02:07,750 my welding screen, which can be my air fed welding screen due to the fumes and also 22 00:02:07,849 --> 00:02:12,699 my welding gauntlets as well. Now we'll head over to the machine and we'll show 23 00:02:12,800 --> 00:02:15,759 you the basic setup that. So on the machine itself, we've got the Lincoln 24 00:02:15,860 --> 00:02:21,129 Electric Powertech. This is our gas, so argon and CO2 mixture and we'll set 25 00:02:21,229 --> 00:02:31,579 on about 12 litres per minute. The wire itself inside here, this is our wire, 26 00:02:31,679 --> 00:02:37,250 one millimeter diameter wire, and you can see it's feeding through and it will 27 00:02:37,350 --> 00:02:40,889 continue all the way through until we get to the touch. So I am going to close 28 00:02:40,990 --> 00:02:46,909 the side of the machine up now and then we'll go and fire the torch up. 29 00:03:39,009 --> 00:03:43,869 What I'm going to do now is talk through a few of the main defects that you can get with MIG 30 00:03:43,970 --> 00:03:50,799 or MAG welding. First one here is an outside corner and you can see 31 00:03:50,899 --> 00:03:55,750 at some point the student lost their gas coverage and has ended up with porosity 32 00:03:55,850 --> 00:04:04,559 very similar to TIG, again, looks like sort of the middle of an Aero bar. 33 00:04:04,660 --> 00:04:13,079 Next one here, student has lost their arc, just towards the end of the weld. 34 00:04:13,179 --> 00:04:20,040 And the final one, the angle of the actual torch wasn't correct for the whole run 35 00:04:20,140 --> 00:04:25,510 of the weld, and they've ended up with some undercut and some excess spatter, 36 00:04:26,170 --> 00:04:30,750 which can be eradicated by turning your wire down or moving slightly faster. 37 00:04:34,190 --> 00:04:38,149 Thank you for watching this video, and I hope you found this video interesting.