1 00:00:13,960 --> 00:00:18,389 Everyone, welcome to this video from Grimsby College, I'm Joel Broddle, 2 00:00:18,489 --> 00:00:22,959 and in this video, we're going to give you a basic introduction into TIG Welding. 3 00:00:23,059 --> 00:00:28,229 TIG stands for Tungsten Inert Gas welding. And you may have seen it as GTAW, 4 00:00:28,329 --> 00:00:34,560 Gas Tungsten Arc Welding. The difference between this one and the main difference 5 00:00:34,659 --> 00:00:38,400 this uses a gas normally it's argon, but helium can be used as well. 6 00:00:38,500 --> 00:00:44,529 And it protects it from contaminants in the air. It started in the 1940s 7 00:00:44,819 --> 00:00:52,140 and was first used in the UK round about 1952. It produces high quality welds 8 00:00:52,240 --> 00:00:59,700 and was first used for welding aluminium, titanium and manganese alloys and produces 9 00:00:59,799 --> 00:01:03,040 high quality wells. Like I said on aluminium, we have an example 10 00:01:03,549 --> 00:01:10,779 of some aluminium welding here. When we welding with aluminium, we'll use 11 00:01:11,139 --> 00:01:15,160 alternating current, but for this introduction, we're going to be using DC. 12 00:01:17,110 --> 00:01:23,940 So on the welding set itself slightly more complicated than MMA, we've got a Lincoln 13 00:01:24,040 --> 00:01:30,060 Electric Invertec V270 machine. On the machine I return lead will be plugged 14 00:01:30,160 --> 00:01:46,010 into the positive. Then we have our TIG torch gas can go in. The HF and then 15 00:01:46,110 --> 00:02:01,700 the actual torch itself. Twist to lock it in place. This set can do scratch starts, 16 00:02:01,800 --> 00:02:07,540 HS starts and lift TIG, we are going to be using the high frequency and all the high 17 00:02:07,639 --> 00:02:12,959 frequencies it just helps you to initiate the arc. On the set itself, we can have 18 00:02:13,059 --> 00:02:19,409 pulse, we can have a slope in, slope out, we can have post gas to help protect 19 00:02:19,509 --> 00:02:25,199 the weld, and we can also have 4 step and 2 step. Now 4 step you press the button, 20 00:02:25,300 --> 00:02:29,970 the machine will continue to go, you press it and it will slope out and stop. 2 step 21 00:02:30,070 --> 00:02:33,909 gives you a lot more control. You can keep your finger on the button and let go 22 00:02:34,009 --> 00:02:37,619 the button to slope it out as well. All depends on what kind of weld you're 23 00:02:37,720 --> 00:02:42,369 looking for and what sort of defects you're trying to eradicate. On the head 24 00:02:42,470 --> 00:02:52,349 of the torch. We've got our button, which initiates the HF, we have the TIG torch 25 00:02:52,449 --> 00:02:57,349 head some of these flexi heads, to help you get the correct angle, some fixed 26 00:02:57,449 --> 00:03:03,360 and position. On the back you'll see we've got a back cap, what the backcap does 27 00:03:03,460 --> 00:03:09,269 it tightens the collar and keeps you tunsten in place. Different sort of back 28 00:03:09,369 --> 00:03:18,079 cap there. If you in a very small, awkward position. We have 2.4 collet as we used 29 00:03:18,179 --> 00:03:25,550 2.4 tungsten. We have a collet body Ive heard it to be called a gas diffuser. 30 00:03:27,210 --> 00:03:31,459 And we have the ceramic. Now currently on this one, we have a size seven ceramic 31 00:03:31,559 --> 00:03:34,729 on there. You can get them all different shapes and sizes. Again, all depends 32 00:03:34,830 --> 00:03:37,639 on what sort of what weld you do in what position you're in, what kind of weld 33 00:03:37,740 --> 00:03:48,720 you're looking for. A few examples here as a size 4, size six, so you see 34 00:03:48,820 --> 00:03:56,069 the diameter will be slightly smaller. And a very small one from scratch start sets, 35 00:03:56,169 --> 00:04:04,439 of a size five. So I've mentioned the tungsten already. As you'll see on these 36 00:04:04,539 --> 00:04:11,459 tungstens, they are grey tipped. It is our ceriated 2.4 tungsten we use ceriated as 37 00:04:11,559 --> 00:04:17,320 they're a multipurpose tungsten, good for a range of materials. We'll head over now 38 00:04:17,420 --> 00:04:25,549 to tungsten grinder and show you how we put a nice sharp point on them. So this 39 00:04:25,649 --> 00:04:29,669 is our tungsten grinder. And this is the pen that's going to help me sharpen 40 00:04:29,769 --> 00:04:43,079 the tungsten. So tungsten slots into the pen and we have the depth set. As we've 41 00:04:43,179 --> 00:04:49,459 given it a tighten, and this sets our depth to the end of the tungsten. To get 42 00:04:49,559 --> 00:04:55,250 this machine going foot on the pedal and the press the green button to start 43 00:04:55,350 --> 00:05:28,559 the machine going. So this now is giving us a really, really sharp tungsten, 44 00:05:28,660 --> 00:05:33,339 and this helps to direct the arc exactly where we want it. The idea of TIG welding 45 00:05:33,440 --> 00:05:45,820 is this stays sharp all the time. I'm now going to take the tungsten out, head back 46 00:05:45,920 --> 00:05:55,839 over to the bench to start the weld. My tungsten now in my torch with a little bit 47 00:05:55,940 --> 00:05:59,500 of a stick out, nice and tight with the back cap, we've got a slightly different 48 00:05:59,600 --> 00:06:02,470 PPE on this time, these gloves for TIG welding give you a little bit more 49 00:06:02,570 --> 00:06:10,690 dexterity. I've also got 2.4 millimeter PZ6500 wire, and this is cut in half as 50 00:06:10,790 --> 00:06:39,419 to how it comes from the manufacture. As you hopefully saw, press the button 51 00:06:39,519 --> 00:06:43,149 it initiated the arc, I've only done a small little bit of weld, and I press 52 00:06:43,250 --> 00:06:47,889 the button again and it sloped out very quickly to complete the weld. Head back 53 00:06:47,989 --> 00:06:52,359 over to the main bench and talk through a few main defects if we can get with TIG. 54 00:06:52,459 --> 00:06:55,489 So I'm now going to talk you through a few defects that are commonly found with TIG 55 00:06:55,589 --> 00:07:02,899 welding. The first one is cold lap. So in this weld here, you'll say that the weld 56 00:07:03,000 --> 00:07:10,470 actually hasn't quite melted into the parent metal on the bottom. The next one 57 00:07:10,570 --> 00:07:17,229 to look at is some undercut, so numerous reasons for undercut, it could be 58 00:07:17,329 --> 00:07:20,859 the amperage was too high, that the scale on the plate was too much with it being 59 00:07:20,959 --> 00:07:29,250 low carbon steel or you just haven't put enough filler wire in. And the main one 60 00:07:29,350 --> 00:07:33,209 with TIG is when you lose your gas coverage, so it could be that you welding 61 00:07:33,309 --> 00:07:37,500 outside and the wind's taken it away, you've not got enough coming through 62 00:07:37,600 --> 00:07:41,759 the ceramic to coat your weld. And it's called porosity. And it would look like 63 00:07:41,859 --> 00:07:45,910 if you snapped an aero bar in half all those bubbles, that's called porosity. 64 00:07:49,170 --> 00:07:53,029 That brings an end to this instruction to TIG welding thank you for listening.