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A Recent Project

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Old 03-09-2008, 02:31 AM   #1
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8 lug thug

At work last week I had to weld some 300# ANSI flanges to some level gage valves. These flanges are rated to 740 PSIG @ 100F, the valves are rated to 500 PSIG @ 100F. Its a bit of overkill but thats what the customer wanted.

Here is a shot of 2 flanges. The one on the right is a 2" 150# ANSI blind flange, the one on the left is one of the 300# flanges. It is a blind flange drilled and tapped for 3/4" NPT.

It is a beefy piece.

I thoroughly degreased the flanges and valves, then screwed the valves in and lined them up so they were the same height.

first I ran a root weld with no filler:

The benefit to this is that I don't have to grind to get to base metal.

I then layed a bead on top of that weld making sure my bead was well into the root weld.

Before wire wheeling:

After wire wheeling:

I used a 3/32" 2% lanthiated tungsten electrode and 3/32" carbon steel filler rod.

Here is a shot of the machine:

This was some thick metal so I had the amperage way up and I still had the pedal to the max the whole time. The machine max is 180 amps, I probably could have cranked it all the ways up.

Close-up of the flange:

The numbers/letters mean: ANSI 300# class ASTM sa/a 105 carbon steel (forged)


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mig...tig...stick...any questions
lincolnmetal's welding learning center

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Old 03-13-2008, 06:48 PM   #2
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That's a nice welder you have there, Dan. And a clean looking weld too!

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Old 04-09-2008, 01:57 PM   #3
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Got lights?

Man, I wish my welds looked that good!

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Old 07-30-2008, 10:13 PM   #4
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I can't wait to learn gtaw. I will have to wait till next fall to take the class though. Unless I can get them to drop the prerequisits. I did some welding of air-fittings on my truck and it looks like this would have made it easier than gmaw.

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flanges, tig welding, valve, welding

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