High frequency used with TIG and the EMF created by all electric welding can affect items in the vicinity, pacemakers are the common example. That's interesting. I have not heard about any bystanders whose pacemakers were affected by HF start or welding in general. That would make anyone with a pac...

High frequency used with TIG and the EMF created by all electric welding can affect items in the vicinity, pacemakers are the common example. Never had issues with vehicles in the area, worked with banks of 400A HF start pulsed TIG machines. Trucks, vans and forklifts all came near with no issue. Do...

Well been having a look, seems that AWS A5.5 lists EXX18-G electrodes as general low-alloy steel, and the E7018-1 H4 R electrode is from AWS A5.1, for carbon steels, so they are indeed different enough to not be directly comparable. Still, to fuel the fire... The Lincoln Kryo 1, a 7018-G, datasheet ...

those beads don't look anything like cellulose rods. Suppose I meant that they have a very punchy and aggressive arc. have you run G rods before? just having a quick look, G rods seam to be for marine steel. i know boats can have some very specific steel grades used. i'm guessing the rods are made ...

Poland308 wrote:Like Tweake says. There a special version of 7018 designed for low temp applications of the finished product.

Closest rod to how these run, to me, is a xx10 / xx11...

just looking at the rod specs shows they are quite different rods, they are not similar at all. i would not call it good or bad due to comparing it with a different rod. you really need to compare it to another G rated rod. Yeah, you do make a good point, may run into another brand's rods one day. ...

I would say the flux is contaminated or otherwise compromised. Either use them or not. Not much you can do short of trying to re-bake them at 700-900°F. Figured contamination was a possibility, just odd that they exhibit this straight out a vacpac. Tried them baked out then left to settle around 11...

So having a weird issue with some rods I have had for a while. The rods in question are Filarc 76S E7018-G, compared with some ESAB 55.00 E7018-1H4 R 1/8" rods I got a sample pack of. The Filarc rod runs pretty badly, the arc is not settled at all and seems to be quite aggresive, and leaves an ...

Oh I got a few I can recommend if you don't know of them already, welding and materials related though I have a whole lot more. Can give you more in depth comments on them if you want. Welding Metallurgy and Weldability - John C. Lippold - link Covers all sorts of failure mechanisms in welds; cracki...

Haha, nice!

It is a good starting point, can start you down the rabbit hole though... Yup, agree about the naming, using their own only adds to the mess. I ain't managing to memorise all the metal compositions.

The plots below, from here , should give you an idea of how the properties of a 4130 weld can change with heat treatment. If you want an indication of what could happen then I hope this helps. In this instance, welding with matching filler requires some work to get right, hence why this is normally ...

Did you know that, in general, plasma arc welding uses 2% to 7% hydrogen in the shielding gas? Learn something new every day, or I do anyway...

I agree with what Oscar is saying on the thickness. For a practice plate to run beads on I prefer thicker, up to and beyond 3/8", as it gives a bit more of a heat sink and distorts less. For butt or fillet welds I try a bit of everything, though the 3/16" to 5/16" mentioned was where ...

Fun. Time for you to get the etchants and hardness testing machine out, along with some other toys, if you are really interested in the mechanical properties. Looks like Eureka 130 is a 4130 rod so you will need to see what it does when heat treated, which is the way to maximum strength. Some intere...

Ha, thanks for the link! Just found these again while looking for something else, if anyone is interested, some tables that show thickness limits in relation to preheat, hydrogen and material composition. Taken from BS EN 1011-2:2001, worth a read if you are interested in weldability of steels. Can ...

No bother.

Forgot to say, let all the water evaporate off the plate after dunking before you strike your next arc!

Yes, I would let it cool a bit more before starting the next bead. You can (NEVER do this for anything other than practice pieces) dunk the piece in a bucket of water every three or four beads. This cools the metal down, to under 100°C at least, giving headspace to let it heat up again. If you are s...

Well this turned into quite the discussion! Very interesting. Dave is right about hydrogen assisted cracking, got that drilled into me during my training, worked on a lot of low alloy steel. There is, of course, a lot that goes into determining susceptibility, have a look here for some information o...

Oh hell yes! Love these old videos, good to see what came before..

This one my old boss showed me, not run the experiment myself, should one day.

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Get them welders, or bosses if that is the problem, told they should be helping you out once in a while.. Ha!

Glad to hear you're making progress.

So if anyone hasn't run into the Repair and Maintenance Welding Handbook from ESAB then it is worth a look. It mainly gives consumable advice, though most sections have technique hints and other useful information. Largely covers welding of wear parts for industrial machinery, with entries on hard t...

Are the tests for paid work or a college course? Doesn't seem like you've said. Got someone that can watch over you, give on the spot feedback? To your original question, I would try different techniques, rod angles, amps, etc. to see what gets flatter results. For the root I concentrate on getting ...

Interesting pattern, thanks for sharing! Given other peoples suggestions, I'm going for resistance seam welding. Looks very similar to some other examples, you can see how one weld nugget overlaps the next, with some material spread over the preceding bead, giving the horseshoe shape.

Hmmm, don't have a copy of D1.1 handy to check, but if the table shown is correct for you application then a 60° groove would not be acceptable on a drawing. You may get away with a 60° fit up if the drawing called for a 50° to 55° groove, obtained from a nominal 45°. How you could interpret it, sta...

Amazing photo, thanks for sharing, along with the source...