Gas Metal Arc Welding: Sheet Metal

Transcription

1 Gas Metal Arc elding: heet Metal irections: Fill in the blanks: Introduction to Gas Metal Arc elding 1. his process is a semi-automated process that requires an in the form of a, fed from the machine, through the liner inside the, and out to the other end of the lead. 2. o understand the difference in versus constant voltage as it relates to these processes, one must really think about how flows. 3. If we measure past one point, and usually that is where the is initiated, whether it be stick or the process or the IG process, we would be measuring weld current or amperage. 4. o when we look at it in terms as it relates to welding, we look at gravity as our, or our force electrical potential so to speak. 5. As it relates to this machine, when I talk about wire feed speed, it is measured in per that is how much is coming out of the end of the gun when you set it. Machine et-p 6. If you look through this chart, you have different modes for steel, these are all weld. his whole top section are synergic weld modes. 7. My are down here. his can do multiple, so we are going to start off with GMA weld mode Primarily, when you get into inverter style, or type machines, they are going to be more specific to direct current applications. 9. hat simply means, by pulling this I am going to get a constant of wire. he is fed from a spool. 10. here is a ton of information, usually on the inside of this machine. And when setting a machine you are going to want to refer to this chart as a new welder. Accompanies: Gas Metal Arc elding: heet Metal 1

2 Gas Metal Arc elding: heet Metal 11. xidation is just air, oxides from the air, getting into the weld. If you allow oxygen or other gases from the air specifically, other gases into the weld pool, and other in the air into that weld pool, you are going to get in the weld pool. 12. he advantages of 75/25 is that it is used to get better action, less, or spatter, on your base metal when welding. 13. hen you get into other beyond steel and different modes of transfer, you are going to have to change up the gas mixture or the type of being used. ire rive ystem 14. For those of you that have done some welding in the past or maybe using some older equipment, you are going to note that the wire from the down on the newer machines. 15. ifferent types of need different kinds of tension. o for example, aluminum, if you are running a push-pull setup, and you are running aluminum wire through this machine, you are not going to use near the tension that you would use on mild because aluminum is very, very and you are going to cause it to not want to feed through that lead. 16. It is very important, and a lot of people do not think this is important for whatever reason, to change the to match the diameter of the that you are using. 17. here are even specific types of drive rolls,, that have little in them for other applications. Changing Filler ire pool 18.his is where the gas is going to be directed out onto the base. 19. And I am using these welper-style, or welder s. hese are great for most MIG and applications because of the way they are designed they are for this very reason. 20. Contact tip this is what carries the current from the that I am going to show you inside this lead to the itself. Accompanies: Gas Metal Arc elding: heet Metal 2

3 Gas Metal Arc elding: heet Metal 21. ne problem, common problem, is when people put these on and they do not them all the way down where they need to be seated. hey will cover up the gas, blocking the gas shielding, and you then will get bad shielding on the other end. 22. e are going to check for in it because a lot of your troubleshooting problems are from people rolling up the leads too, or getting it kinked or hung on something, and putting a kink in this liner it is a metal, it will kink. 23. e are going to check it, we are going to run our hands down it, give it a once over, check it out, make sure it is properly and everything looks good, then we are going to put it back on the machine. 24. You can hand-roll it back up and put it back in and then take a chance that it is going to work and it is not going to on you, or you can that wire off. Cable Liner Maintenance 25. ow as I pointed out, this is a process and there is a on the end of that gun. 26. ow also on this particular model and many models, you can disconnect it this way without unplugging the entirely. ome models have this and some do not. 27. If you look at the inside of them, it is not a bad idea, it is a good opportunity to take some air and blow it out, because you will get a lot of deposit from your. 28. ice line again, makes it easy to feed, then we want to make sure it is push it down and kind of it in place. 29. o we can the gun we are going to do the order of how we took it off so we are just going to slip it in like so and it down. 30. he only line up and go in one way, so if you are putting one of these on, do not force it. here is only one it is going to go. Accompanies: Gas Metal Arc elding: heet Metal 3

4 Gas Metal Arc elding: heet Metal Filler ire pecifications & Classifications 31. I mentioned about up your liner. I like to stick with good stuff. his is a range, and in the school setting, it works very well. 32. o the the stands for, the stands for rod it is in a rod form. his is a form rolled up on a spool. 33. he, stands for solid wire means it is there is nothing on the inside of it it is just solid. 34. he -6, that is, that is special characteristics of this particular type of wire. hat is going to give you the alloying elements, when and where to use it. 35. ome are better for welds. ome are better for dirty materials. ome are better for nickel alloys, different types of alloys, you know, blends of materials, so you want to really make sure that you are paying attention to what you are using and refer to your base metals and filler metals together. Installing Filler ire pool 36. You want to make sure that the on the inside of the sits on that little prong. therwise your wire, when it stops, it is going to unspool a little bit and you are not going to get good on the other end. 37. ome people like to use cleaning pads on the lower quality, or wire or filler metal, and what it does is it cleans the material before it goes into your drive roll, and it just pops on like so, and you clamp it on. 38. o we are going to power up. he natural thing for people to want to do is just to crank that speed up, run it as high as they can because they are impatient and they want to feed that on through. 39. uring the process this occurs the minute you pull that trigger. You are going to have fed to your base metal. 40. Good protocol is to power down and any time you are doing any kind of or work on your gun. Accompanies: Gas Metal Arc elding: heet Metal 4

5 Gas Metal Arc elding: heet Metal 41. First thing is, we are going to off, and we are going to take that totally out. You have got to be very, very careful not to lose it. 42. You use different stick out distances based on your and what you are doing. If you use a longer stick out, you are going to probably your weld current slightly. 43. As a rule, I like to have that nozzle where the contact tip is about an eighth of an inch no more than that. 44. As I pointed out, the contact tip is. In other words, it is charged, so if you set it down and it makes contact, or you touch it when you are in your joint configuration and it makes contact, you are going to it out, cause the wire to possibly arc to the tip or arc to the liner somehow and a bird s problem will occur you need to be very careful about that. 45. You should always pull your parts off, check them out and be sure they are in good order. 1F Lap Joint 46. e are going to do a 1F lap joint, meaning the weld is flat, so the piece has to be where the weld axis can be flat, which means that I will be running right here. 47. I am probably going to do a little bit of both in this, just to the different types of you can use. 48. o on this application, on joints, you usually want to aim to the piece that can more heat, which would be the piece and I am going to aim a little bit over here and watch it into that corner or wet into that corner. 49. If you fluctuate the stick-out, you are going to get a change. 50. o, whenever you are making a movement or, you are going to see a little in the baking frying sound. 51. e used the forehand technique or the technique here. 52. I did use a little and maybe a slight. Accompanies: Gas Metal Arc elding: heet Metal 5

6 Gas Metal Arc elding: heet Metal 1F -Joint 53. Your manufacturers of the and your wires, they are going to tell you to run it. 54. Many textbooks out there today say that the method, or dragging, is going to give you better. 55. he to running forehand, or pushing, is line of sight. You get a better line of sight, a little more, see what you are doing. 56. he first I am going to use, I am just going to drag it, and I am just going to run a straight stringer pass, no, and no movement. 57. ome people like to see that weld nice and smooth, some people like to see nice pretty in there, nice little pretty ripples. 58. Check my position, check my point, and make sure I can get from A to Z. 59. e just it with very little motion and just drug it down the center of the joint, bonding the two pieces of together. 2F Fillet 60. You want to wipe off any excess, or particulate, underneath your piece. 61. I am going to work in here and I am going to try to some, a little bit of a in this thing. 62. o always make sure, if you use a pattern that you are going in the correct direction with it. 63. I am at 16.4 volts and IPM, inches per minute, wire speed. 64. I like to set it at about inches per minute to help you get a little better start. 65. I should point out that if you heard some or popping and inconsistency, I made this weld on the backside of the previous weld, and when you do that, sometimes you will get a little through, a little on your base metal from the previous weld. Accompanies: Gas Metal Arc elding: heet Metal 6

7 Gas Metal Arc elding: heet Metal 66. It is a nice equal fillet weld, meaning each leg moves up and goes out the same. 67. e went, so from right to left. It increases my and makes it a little easier to do. 2F Lap Joint rag Motion 68. I probably need to turn my heat on my machine a little bit. 69. I need to probably turn that down, turn my settings down just a touch. 70. ome people certainly can make it look just as pretty dragging it as well as they could by it. 71. It would be sufficient for most small sheet metal work. 2F Lap Joint Push Motion 72. hat we are going to do here is we are going to do a push and a. n one side we are going to do a and the other side we will do a drag. 73. I want to make sure that I get into that piece and then just wash it into the top wet it into that top. 74. he weld s going to be real and it is going to roll itself, giving it overlap, and it is not going to be a very pretty weld if you do that. 75. Incidentally, when you are using a grinder, you always want to make sure you use the. o not use the trigger, because if the grinder gets away from you it is not going to stop. 76. I probably should have my tack down a little bit before I started. 77. ere I used the push method or the method. 78. I might have had a little touch of right in this area. 3F Lap Joint Vertical p & own 79. It is pretty much the same as the, but some of the differences are, again that piece. Accompanies: Gas Metal Arc elding: heet Metal 7

8 Gas Metal Arc elding: heet Metal 80. I could have washed in over to this wall, this piece, a little wider and got off of my a touch. 81. Maybe I could have turned my machine down just a touch more so I could move a little. 82. ownhill s a great whenever you have to do an outside corner joint. 83. You have got to remember where to place your material, where to aim, and how to wash it into that lip. 84. I would have like to have seen it in a little flatter, so maybe move out a little bit wider in my motion, or step a little, but all in all, it is sufficient for this. 85. Lap joints are difficult to carry uphill, so the downhill method sure makes that much easier. 3F -Joint Vertical p & own 86. I am going to direct the of my arc and my heat into the piece that can more energy, which would be the piece. 87. A lot of people might change the direction of their and work up the piece that can absorb the most by working up the back and over. 88. If I just run a straight in here, most likely I am just going to get it falling out and I am going to have to run it really. 89. You want to be fairly perpendicular, maybe degrees off of perpendicular. You do not want to be way back and you do not want to be pointing way down. 90. You are going to turn way down when you do this, or turn down more than you would in the or the position. 91. I am going to leave my settings at about to volts and about IPM on the wire speed. Accompanies: Gas Metal Arc elding: heet Metal 8

9 Gas Metal Arc elding: heet Metal 92. ome work, if you ever do a procedure or anything that is qualified with a circuit process, it is most predominately going to be. 93. he biggest trick with this, keep in mind, is turning your down as you move vertically up. 4F Lap Joint verhead 94. It is a little more difficult because you have to be really of your angles. 95. I could, but at this, I tend to move a little. Most of us move a little slower overhead. 96. It is a little, a little flatter, and has a nice little roll to it. 97. It seemed like we were having quite a bit of current change in the area and that is going to give us the that we see, so I would like to keep that thing a little bit smoother when you re running across there. 4F -Joint verhead 98. Your angle of your is a reverse. It is just the opposite of what you would be looking at if this thing were sitting in the 2F. 99. he aspect and the actual is really not all that difficult You do not want to set your arm up, you know, where you are going to get hung up where you cannot go any It is a whole lot easier if you keep your arms to your body to keep the down You could run a risk, especially with a metal arc process, even with the MIG process, of a BB or buckshot laying on that hood, melting through and that really expensive filter lens o spend a little time getting and remember how you got there It is a little easier to control than a big oscillation in. Accompanies: Gas Metal Arc elding: heet Metal 9

10 Gas Metal Arc elding: heet Metal 105. o on metal it is often times easier just to kind of step and wait, step forward and wait. 1G Butt Joint 106. ow you can commonly butt these together but we decided we would do a little open on this particular joint I have turned my machine down and I am going to work the edge of that puddle You don t necessarily need to go and it prior to welding, but it is not a bad idea, once you tack it into place, to go ahead and take your and lay it on edge and cut you a little groove there o you may not even have to the weld if you cut a little groove in there and you move quick enough, you can probably lay that weld in pretty nce again short circuit on gauge material You can do that without necessarily any, just running the machine a little hotter. Accompanies: Gas Metal Arc elding: heet Metal