Disc 1 - Carbon Steel
Thunderbolt Scratch Start ...Set up for scratch start tig using a simple DC stick welder.
Welding Bookends TIG welding socket welds for some industrial bookends
Lap Joints CRS 2F .125" thick lap joints using carbon steel
Delta TIG is a Job I did for a job shop that involved some small fixtures that were already located by pressed in pins.
210EXT Tube on Lathe...positioner welds using a turntable along with my very first welding lathe made from an old bicycle.
TIG Weld vs TIG Braze shows difference in strength between weld vs silicon bronze and aluminum bronze tig brazing
Disc 2 - Stainless Steel
Stainless Sanitary Tubing...scratch start tig on sanitary stainless tube and purging tips.
Stainless Lap Joints tips for tack welding and difference in standard collet bodies and gas lenses
Multipass on Shafts welds in shaft journals and some walking the cup
Freehand vs Walk the Cup shows both techniques on a stainless steel shaft end.
Distortion on Square Tube ...tips on distortion and how to sequence welds to keep corners square
BB Box...building a stainless steel box using outside corner joints and importance of gas lens cups and chill bars for stainless steel
Disc 3 - Aluminum
Aluminum Laps..using a transformer tig welder...Lincoln 175 to weld lap joints and showing the difference when you mix a bit of helium with the argon.
Aluminum Pie Cuts...Roy Crumrine did a job for a local company where he welded up an intake tube made from aluminum pie cuts.
2F Tee - Lincoln 175.. a very simple tig welding machine used on a 2f horizontal tee joint.
Cast Aluminum...At JD Brewers shop doing a cast aluminum weld repair on an outboard jet pump.
Aluminum Cast Fittings...Roy Crumrine doing positioner welds and also tips for building a stand for a prop.
Expansion Tanks..Roy fitting and welding Aluminum expansion tanks
Outside and Inside Corners...Aluminum tig welding techniques
Disc 4 - Pipe
6G 6 Inch Tig Root techniques for pipe
6G Part 2 - Hot Pass
6G 2 Inch 309 Tig welding root pass in 2" pipe using purge and 309 stainless rod.
Pipe Test Tips...tips for passing a 6g pipe welding test
A good acetone wipe to remove all oils and residue helps a lot.
Porosity is the main cause for failure on aluminum butt joints so eliminating all potential causes for porosity is good step.
Aluminum more prone to porosity than carbon or stainless steels...and oils and residues are prime causes of porosity.
I learned this one thru lots and lots of testing.
When I worked for a major Airline, I tested welders on all metals and sent the test welds to the NDT inspection department. There was an occasion where we had trouble getting aluminum tests welds to pas x- ray so we designed an experiment to identify the variables most likely to cause failure.
Filing the sheared edge of the aluminum welding test pieces made a bigger difference than most other things.
AWS D17.1 limitations for linear porosity are more stringent than for scattered porosity so it makes sense that the contaminants found along the sheared edge of the plates might cause excessive linear porosity.
Use a new clean file dedicated to aluminum and when you think you have removed all the rough sheared surface....file a bit more just to make sure.
Trust me...it makes a huge difference on the test results.
Scotch Brite discs, sanding discs and other abrasives can embed grit or smear polishing compounds into the aluminum and cause porosity.
But a clean stainless steel brush will not embed anything.
I recommend using a fine cup brush with an angle grinder.
After filing and wire brushing, another wipe down with acetone will remove any residue.
There is no requirement to use a fixture for this test but it is advised.
Aluminum test plates will become saturated with heat to the point where everything acts differently.
Some type of fixture is very helpful.
The fixture used in the video was made in one work day out of carbon steel.
It has the capability for argon backing gas but I didn't use argon for this test weld.
While there are some situations where argon backing helps, it is possible to weld an x ray quality joint without argon backing gas.
machine amperage was set to around 85..actual amperage used was 72 amps.
I used advanced square wave
AC frequency was set to 100 hz
AC balance was set to 30% cleaning
#5 cup using 14 cfh argon
3/32" (2.4mm) 2% lanthanated electrode
1/16" (1.6mm) 4043 filler metal