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Mind the Gap - Tips for MIG Welding 3 popular gap sizes
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- เผยแพร่เมื่อ 11 ก.พ. 2021
- In this #WeldingWisdom video, David discusses tips and tricks for MIG welding various gaps. Tune in as he talks about ideal machine settings and techniques to prevent dripping through your gap.
To learn more, visit www.generalair...
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Hi, I'm David with General Air. When you're MIG welding, eventually you're going to run into some gaps that you have to fill. We're going to take a look at how to set your machine and what to look for when welding some thin gaps, all the way up to some pretty big ones. The first gap we're going to tackle is 1/16th of an inch, and I'm going to use an 030 MIG wire I've got my machine set at 175 inches per minute at 16.5 volts. I'm going to check these settings on my first weld to see if it's too hot or too cold and see what I need to do there. My technique is also going to be pretty simple. I'm going to drag the gun because if I pushed it, well the wire would just go through the gap, I'm going to drag the gun and not going to weave it back and forth, in order to keep the heat as low as I possibly can. Let's see if it works. It made about a half an inch, and then I blew this big hole in it. So, now I've got to go over to my machine and mess with my settings. What do I do? Do I go down with my wire feed speed? Do I go up? Do I mess with my voltage? Well, let's remember the theory here with MIG - wire feed speed controls amperage. So if I turn that down, I'll have less punch into my material. So, I am going to turn the wire feed speed down. Also, if I turn my voltage down, that's going to narrow my bead profile. This bead is pretty wide, so I know I can narrow it up a little bit more and make sure that I can focus and concentrate all the material right in the middle of the weld. Now, how much am I going to turn it down? I'll just try 10% of the wire feed speed and half a volt and we'll see what happens. I have my wire feed speed set at 157 inches per minute and 16.5 volts. And not only was I able to fill in the hole that I blew with my first weld, but the weld, when I terminated it has a nice crisp edge here. So I know I have my settings correct, but I still don't want to just go all the way down the line even if I have correct settings. If I do that, that's going to overheat the parent metal and then I'm just going to end up blowing through. So I only want to weld in about a half inch to an inch at a time. Another factor in that is minimizing warpage. I don't want to go from point A to point B and warp the whole plate. So, I'm going to stop my welds intermittently and let everything cool down. I'm also going to take some welds and go the opposite direction that I've been going. So I've been going from left to right here. So, now I'm going to go right to left. That will counteract the distortion of this weld. And we'll end up with a flatter plate in the end, That turned out great. I think our settings are nice. We put a very low amount of heat into the plate. I did weld from this direction to this direction to try to counteract the distortion that I'm getting. I'm still going to get a little bow in the material, but that's okay. I can fix that post-weld. I'm going to let my parent metals cool, and then we're going to weld out the rest of this. The next gap that we have is a quarter inch, wide. Our settings of 157 inches per minute at 16.5 volts may work. I'm not sure, I'm going to have to just strike the arc here and walk the gun back and forth between the two parent metals. This gap is so wide I can't just keep the gun in the middle like I did with the first one, but I'll probably have to end up turning my wire feed speed down. The larger the gap, the more likelihood that that weld's going to sag in the middle. You got to cool things down and get a little bit more surface tension. Let's see how it goes. As I expected, our settings were a little bit too much here. I've got too much amperage, so too much wire feed speed. How do I know that? Well, I could see the edges of my material here, we start to see them getting chewed away on the sides. So I know I'm just getting excessive amount of penetration, it's really starting to chew, you know, my parent metal. That's not my goal here. My goal is to span this gap. I'll get penetration on the sides. I'm not worried about that, but if I would've kept going, this hole would have just gotten larger and larger and larger. All right, so now we got to turn the wire feed speed down. Well, where do you go? Now I'm just going to go 10% again, turn down by 10% and turn my voltage down just a little bit, maybe a third of a volt. That's a very small little energy, and I'm just going to go down in small increments until I get the results that I want. I turned my wire feed speed down to 140 inches per minute and my voltage was at 16.2 volts and I can see that it's not cutting so far.
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This is one of the best MIG videos I've seen for sheet metal.
Such clear, concise explanations and showing what to look for and what might come up. Thank you!
Awesome video. Very helpful thank you
Very impressive gap welding!
No doubt this is absolutely the most helpful tutorial for filling gaps on TH-cam, it hits all of the areas needed to do a good job, and your teaching methods are incredibly clear, and superbly delivered, the bottom line here is that you are an awesome Instructor. Thank you.
I have watched countless videos on welding. These answer all my questions and I learned more in this one than dozens of others. Basic machine workings and welding strategy/settings of the type you never see anywhere else. Simply terrific. Thanks.
Never thought of the wire speed controlling the amperage! Thanks for that. Clears up some things for me.
Brilliant instruction !!!
This was so helpful in working the welding for a floor panel! Thanks for the video!
Excellent tutorial , I learned a lot in such a short time. Thank you from Western Australia down under.
An excellent very informative video
Very informative video, thank you!
Superb, clear exact explanation of how the MIG settings work with each other. 👍
Great ideas bud, thanks very much!
Awesome! One of the best tutorials I have watched. Thanks you just made me a better welder.
Great to hear!
Great tutorial. Thank you!
This was so helpful. Thank You for thee advice.
A good tutorial.Thanks for sharing.GBY!
Not so much likes, I don't know why but valuable things.
On the large gap would it help to hold a piece of copper behind it as you go.
Great 👍 video. Thanks for the tip.
Great video! Thanks
Very helpful video.
Tq, it’s really help me in my work.
Great explanation, thank you! What is the thickness of the plates?
These were 18 gauge plates.
True, but not easy to weld thin, auto-body panels. Suggestions?
We suggest using a smaller wire such as .025 and copper backing.
Thank you 👍
Incredible, Thank you!!! Liked, Subscribed, & Alerts
In the 1/16th demonstration he mentioned welding in the "drag" method (aka backhand or pull method), he does that for the first good weld, but then goes on do, what appears to be, the Push method. Maybe I am not seeing correctly, someone please correct me if I am wrong
No, you are not wrong, this is a method seemingly many Welders don't know about or use nor understand, the purpose of this method is to prevent or curb warpage and burn throughs, using both Push and Drag methods minimizes warpage because using the Drag method produces more heat into your plate than the Push method, so to continue welding and decreasing the amount of heat input into the plate, He then switches to the Push method which is the cooler method that allows the area to cool off a bit to minimize the heat distortion, I was taught to alternate start with Drag switch to Push over and again until completed
Copper welding spoon at HF 💯
Fit up is everything. This is a whole bunch of stuff you don't want to be doing!!
You are absolutely right, the better the fit up, the better the weld! This video just illustrates how to weld a gap if you don't have an option for great fit up.
On the first weld you said you were turning the voltage down .5V but you kept it the same at 16.5V 😒
Great information and demonstration, but the tediously monotonous background music ruined the vid, as does ALL background music.
travel speed
stickout
Or mig welding whit gas