I'd drill it out. You can take a matching bolt and make an accurate bushing on a lathe for a say 1/4" drill bit. Drill all the way to the bottom with the bushing and second drill with say 8.5mm or so without bushing. The remaining thread usually is easy to pluck out. I would not even try to wel...

+1 to Steve. 6061 will substantially "harden" in about 2 weeks after welding\annealing. However it depends on how much heat was pumped in it. The nature of "hardness" in cast and rolled 6061 is different. To weld 3/4 bar to 1/4" flat you need a lot of juice and possibly an a...

Merry Christmas from Wisconsin. Best wishes to All!

Just to verify... you use 100% argon and NOT C25 right?

I've done A2. 3/32 A2 wire for the filler and very high temp preheat (450°C +). Right after the welding the piece goes into annealing oven for full annealing cycle.
O1 will be more difficult because it has higher quench distortion than A2.

As far as I know there are no welded parts in a turbine itself. Blades are assembled with the "tree" connection. There are welds in the tubing flanges etc. but they cannot cause such a failure. Usually the main disk is forged from Ti and is prone to fatigue fractures and Ti defects. That k...

Just from my little experience in cast aluminum repairs: 1/4" thick is easy to weld with just Argon. Cleaning action(percentage) is adjusted to a particular piece and case. Alloys, contamination, ambient conditions, welder, etc. makes a difference. 2% Thoriated I thought to be the toughest(heat...

As long as we busted the same prop once again last Weekend I welded it again. It does not have any value anymore so I played around and figured that my gas flow was too high for this particular cup. Once I dropped it to 12-13CFM everything became normal. Good clean puddle, quiet arc(except the AC bu...

How about making a new bracket?

I'd suggest you keep it in the boat for a spare and buy a new prop to run. Kent, that's the plan... after I found that I cannot fix it well. :( On the other hand - how much longer the 30 years old motor can run. Is it worth to buy a new prop that will way outlast it? And I "sail" like an ...

Looking at amazing works shown on this forum decided to "fix" my own prop. It is about 30 years old Evinrude and had seen better days as you can see on the pictures. The motor exhaust is through the hub so there was enough oil and other s--t through the years of use. "welded" at ...

250EX almost two years - no problems so far.

Otto Nobedder wrote: I use a single regulator, but tee to two flow meters.

Interesting. My flow meters have regulators in their base, I bet yours do too. They supposedly drop the input pressure to 50psi and you control the air flow from there with the manual valve. So you might have two regulators...

+1 to Oscar.
Y-connection for the gas is a bad idea. I have two separate regulators and flow meters on the same gas tank. Works like a charm. I can set any SEPARATE gas flow for SEPARATE outlets. None affect another.

If you make the arc longer, you increase the voltage (and the width of the arc cone). And since current is constant, an increased voltage means more power (watts) going into the part. So more energy spread over a larger area. Ok, so the "energy/heat density" stays about the same? Makes se...

dirtmidget33 wrote: NO a shorter arc length will not make It hotter

I thought that you can "concentrate" or "fan" the heat (given that the current stays the same) by changing the distance in certain limits.
Maybe I am wrong

If you happen to have 300 hours of spare time, 7,000 American nickels and the desire to make 35,000 welds, then you can make a nickel couch. Interesting.... Technically the currency belongs to the state and any misuse of the banknotes or the coins is illegal and punishable. For example it is illega...

Steve,
it's more like a diffuser. It supposed to make a somewhat laminar flow.

Ultrasonic X 2 times with TSP and fine mesh glass beads. After that acetone. It worked! I do not know if you can see the difference but I certainly do. The bead looks almost the same on the picture but it is MUCH flatter now. The distance between the holes is 1/8"; the bead is about the same wi...

Actually from the original picture I would conclude that someone tried to weld with a solid wire on a flux core setup or ran out of gas.

Thanks for the suggestions. So it boils down to "clean, clean and clean some more" I was asking around and was told that this lube might be silicone based. That might explain why my acetone wipe did not work and arc did not burn it quickly. Silicone is too damn stable and heat resistant. A...

Sorry for my welding porno but I would like to find a better way to weld this sh!t. Perforated aluminum is 0.0325" thick. Supposedly type 3003. Fit was "OK". That means the side seam was straight and the only problem was in some pieces the cut went through the holes... Not much meat t...

We use ultrasound welding for the copper tubing all the time. It is very quick, flame less and certified to weld tubing FILLED with flammable substances like isobutane. The physics is simple. If you for example hammer a piece of metal it will heat up. Ultrasound welder hammers the welded piece 20000...

I like it! Very well thought through design.

deleted