Welding Tips and Tricks

Howdy folks. A new forum member her from the South.
I have a Miller 252 MIG welder along with a SpoolMatic gun attempting to weld aluminum. I've been able to lay somewhat decent beads on alum. so far but always seem to have a small crater with a pin hole in the middle of it at the end of every bead line I attempt. I've tried different things to alleviate it but nothing seems to help.

Any/all suggestions are appreciated.

RPat

Welcome to the site RP. As for your crater issue. Have a look at this video Jody just did. http://welding-tv.com/2014/07/08/scratc ... -practice/ It's tig but this idea might help your problem.

Good Luck!

RPat welcome to the forum.

Thanks guys for the feedback and welcome. I watched the video. Very good info, I'll try some of it and see what happens.

Thanks again guys for the recommendation. After watching the video and applying some of their techniques, it has greatly helped to reduce my issue. I also tweaked the settings on the 252 as well. Now the only thing I'm seeing it much more black soot around my welds. Trying to find out why. Ideas?

New question for you: Laying aluminum beads on a test piece looked great so I assumed that I was ready to start on my "real" project. The first step was to weld a piece of angle to the top of a circular pipe. The pipe is old aluminum so I brushed it with a s/s brush along with the small piece of angle.
The result: The welding would bead appearing to look like marbles (of different sizes) instead of the stacked dimes look I was aiming for. Along with this the aluminum wire from the gun would melt to the tip. I played around with the voltage and wire speed along with gas flow but nothing seemed to work. I never could get the "stacked dimes" weld I was looking for. Luckily my grinder did a somewhat decent job grinding down the buildup of aluminum on the piece. I never could reach the end goal of a clean "stacked dimes" look. Any ideas what could be happening ?

RPat,

We're moving a bit past the "introduction" stage, so I hope you'll understand when I copy this topic wholesale to the MIG forum...

Thanks,

Steve S

hello Otto. No sir, I understand. Thanks for your help.
I wasn't sure how much time was involved during the "intro" stage. So that's why I went into the questions phase. Sorry if I violated protocol.

RPat wrote:hello Otto. No sir, I understand. Thanks for your help.
I wasn't sure how much time was involved during the "intro" stage. So that's why I went into the questions phase. Sorry if I violated protocol.

You didn't violate protocol, more members will read and answer your specific questions in their respective places.

As for your questions, when you practiced, was that material thickness the same as your real pieces? This will have a huge effect to your weld characteristics. At this point I think a picture is in order as I can think of several things it could be. One is if it is balling up you do not have enough heat for the given material.
-Jonathan

Jonathan's right,

It wasn't "protocol". It's just easier to get answers when the question is moved to the appropriate forum.

Steve S

Regarding the issue: I increased the voltage and the wire speed, gas flow still at 25 but still seeing the same issues. I can't seem to get a smooth metal flow started. It will arc, deposit a marble and wire will melt up to the tip. Nothing so far that I try seems to help resolve this issue. Any thoughts are greatly appreciated.

How close to the work are you holding the spool gun? Should be about 3/4 an inch for spray transfer.

RPat,
Check all your connections on your Argon lines and that the spoolgun is fully inserted into the machine and not restricting gas flow. The black soot and not being able to establish an arc makes gas flow a suspect in my mind. Low pressure on your Argon tank can cause moisture issues also, below 500# seems to be when these issues arrise. Loose connections can siphon Atmosphere into your Argon and cause all manner of issues.

This coming from a person with very little spoolgun expierence, so take other's advice if offered.

Len

Hi guys, thanks for the responses. I will check the gas lines. The argon bottle is new so low volume shouldn't be an issue but I'll check it anyway. I'm holding (or trying to hold) the tip around 3/4" away but that could vary. I called Miller directly, spoke to one of their experts there and he made me aware of a factor, and me being a newbie with this 212 and spoolgun along with a newbie regarding different factors of aluminum, that the piece of alum. ladder I'm having so many problems with is likely because of the grade of alunimum. I'm using 4043 wire in the gun and it's very likely the alum. ladder is the 5000 series alum. which won't work. I've made it work but it's very ugly. Thankfully I had a new alum. grinding wheel to correct some of the wire buildup.
So this weekend I'll look into buying the 5000 series alum. wire and attempt it again.
Thanks to all for the suggestions.

Also, just to complete the troubleshooting loop I was embarked upon, I tried welding some of the alum. I've been practicing with and after tightening the spoolgun wire feed, I started laying some very decent beads again so the different grades of alum. has to be the factor with the ladder project.
BTW: I bought this ladder from a junk yard 15 years ago, haven't done anything with it till now. This ladder I was told was on a public fresh water treatment plant on one of the tanks so it's likely a higher grade alum. compared to what I've been using.

Welding on a ladder should sound alarm bells ! no disrespect on your ability but ladders very rarely have any welds on from the factory & are assembled by other methods - they are very often high strength alloys that can take the imposed loads while being very thin to keep weight down so welding on them is not a good idea - even if the weld is sound the HAZ will be a weak spot - if the ladder was a static type thing bolted to a structure where weight was unimportant then it may be weldable - are there any welds on it or are the rungs " expanded " / belled into the sides ( like boiler tubes ) ?

Yeah,
Most Aluminum ladders are 2000 or 7000 series Aluminum, and most are riveted.

To my knowledge, they are un-weldable, but I've never tried.

Hi Guys, thanks for the responses. The ladder rungs are welded to the main tubes. It appears that whoever did this drilled holes in the main tubes and slid the rungs thru the holes and then welded them together. It's a very strong aluminum ladder. The pieces of angle iron (2"x2") welded to the main tubes appear to be fairly strong but I've yet to put a large amount of weight on it. I can make a new one but since I had this one for over 15 years, just holding onto it for a project like this, I thought I'd try it and make use of it. Yes, I am a pack rat and when I do throw away anything, I need it soon after.

That looks like a tubing ladder, for a boat or something.

I thought we were talking an aluminum roofing ladder...

That looks like it was made with welds....

My bad.

That's exactly what this ladder will be used for, my boat. I will pin it to brackets on the boat and take it off or fold it up and secure it when not in use. Welding these pieces of angle to the top of the ladder was where I ran into big problems. Luckily a had a new alum. grinding wheel to make it look somewhat decent. The only thing I question now is the strength of the weld itself. I may end up making a new ladder but I wanted to try this first.
Thanks for the comments gentlemen..........

Sorry - My comment was based on a roofing ladder also - if this was welded originally I see no problem altering it - only caution would be on thickness of tube - many clip together scaffold towers are tube of about 2" - but are very thin - although there are welds on the components most joints are mechanical ones & the weld just stop them pulling apart - if the material has sufficient thickness weld away - if it's real thin then a little planning of joints is required - but if it's only a short piece on a boat I expect you'll be fine if the weld is visually OK - ( whats the worst can happen ! you most likely already done worse once boat & beer get together ! )

No problem guys. This is the first alum. ladder I've seen that had welded rungs and the reason it caught my attention.
Now for another question that I need your expert opinions: I had the 212/spoolmatic gun tuned and welding well on pieces in preparation to weld them to the boat with the purpose of attaching the ladder to with pins. BUT, once I attempted to weld those brackets to the aluminum platform at the rear of the boat I started to see sputtering of weld being deposited and not the smooth flow of bead that I was seeing on my worktop. I placed the ground clamp very close to the weld site as well. Should I assume that the 4043 wire I'm using may not be suitable for this aluminum or should I play with the welder settings (ie: turn up the voltage and wire speed)?

What are you grounding on, the brackets or the platform?

I'm grounding on the platform very close to the weld itself.