Dual Shield Flux Core Welding Class at Hobart

[Don52]

You are correct, it does look like a squirrel ladder.

-Don...

[Don52]

My friend and customer Chuck sent me a picture of the installed bird feeder. I still am not sure why he required a three foot cantilevered bracket to support the bird feeder, but his wife is thrilled with it.

15. feeder installed

-Don...

[Don52]

At home I am using:

.035" Lincoln Outer Shield 71M wire

.045" Kobelco Frontiarc-711

At the Hobart class we used:

.045" E71T1 wire (Don't know the brand)

-Don...

[Don52]

Thanks



Dual shield flux core welding uses a inner shield of flux and a gas outer shield. Lincoln calls the process Outer shield for this reason. In our case we used 75%Ar 25% CO2 shielding gas. The gas is not optional. If you turn off the gas or have too long of a contact...

[Don52]

I really like dual shield flux core welding for the following reasons.

• It has great penetration on thicker metal
• It has a high deposition rate
• I can use my existing $2k welder with knurled feed rollers to run it.

(As opposed to purchasing a $6k spray pulse welder)

• The slag holds the puddle in

...

[Don52]

16. cover pass


If I had run straight stringer beads it would have taken ~21 passes. I used narrow weave beads instead.

17. Run on tab


18. Vertical test samples
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[Don52]

I chose to use multiple weave passes for each fill level.

11. Overhead fill pass


12. Overhead cover


For the one-inch-thick plates we cut 3/8” strips and side bent them. If you look closely, you can see the weld profile in the test sample.
...

[Don52]

I did a single weave pass for the cover. They told us that keep weave passes below one inch.

6. Vertical cover


7. Vertical test samples


8. Overhead cover


The sample passed even with the cracks, because the cracks didn’t occur...

[Don52]

For the past two weeks I attended a dual shield flux core welding class at the Hobart Institute of Welding Technology in Troy Ohio. It was the sixth Hobart class that I attended. Hobart has two basic welding class series: Structural, which is five months long and Pipe, which includes structural and...