OA welding Ali

[LooseDuece]

Some of my latest trial welding pic's.
The weld seems to be dirty yet I have cleaned and fluxed the rod and area well ?
In most welding vid's I see the welder keep the torch into it.
I find i have to take it away or a blow through will occur.
I've adjusted the flame, tip and regulator settings.
In last pic I can still achieve a nice result after joining the 2 pieces, but the time taken is much more than if laying a proper flat neat bead.

Bead dirty looking.jpg

Back.jpg

Other welds.jpg

Can achieve.jpg

[David Gardiner]

Originally Posted by german8rcoupe

I was surprised and pleased to see in that Kent White vid that he starts by blowing holes at one end! That's what I do!

Practise,practise....

Put yout first tack about three quarters of an inch in from the edge and you wil not have this problem.

[kjc]

David,

I suspect the tip sizes 1,2,3,5,7 etc relate to the gas consumption in cu-ft/hr of the rig with that tip. Bigger number = larger hole and thus higher gas consumption.

I believe the only reliable way to compare different manufacturers tips is either by drill size (of the hole) or consumption. 00, aw202, #5 etc are all pretty meaningless.

For example, I use an aw202 tip in my Smith Airline for 19ga steel and it is a #69 drill size and 3cfh consumption.

ken

[TheRodDoc]

here is a guy that has collected and put together in a chart a lot of tip sizes of several brands and their orfice size.

http://bikesmithdesign.com/Welding/Tips.html

[David Gardiner]

Ken, that is the only info you will get on the tips here. We have guides that tell you what tip size to use for what material so its all you need.
Of course it does not help if you want to compare our tips to those from another country.

Richard, The link would not work for me.

[HEATNBEAT]

Welding Tip Size Comparison Chart Click here to download an Excel file with this info. If you have info on any other torches/tips, please let me know at Mark@BikesmithDesign.com

Thanks to; Attila Kokeny for the European manufacturers, Messer and CGE Rhona. They are not exactly the same sizes as the US tips they are aligned with, but close enough for comparison. He also provided the Welding Thickness/Tip Size chart. Aaron Novak supplied the #6, #7 and 1/2 size Meco Midget tip sizes. Peter F. informs me that in Australia the big name in gas welding equip. is CIG. Their tip sizes, 6 thru 32, correspond to 0.6 to 3.2mm orifces. Far too logical. Welding Thickness Tip Size Inches mm Drill Size Inches mm 1/64 0.38 76 0.020 0.51 1/32 0.78 72 0.025 0.64 1/16 1.59 68 0.031 0.79 3/32 2.38 62 0.038 0.96 1/8 3.18 56 0.047 1.19 3/16 4.76 54 0.055 1.40 ¼ 6.35 51 0.067 1.70 5/16 7.94 48 0.076 1.93 3/8 9.53 44 0.086 2.18 ½ 12.70 40 0.098 2.49 5/8 15.88 35 0.110 2.79 ¾ 19.05 30 0.128 3.25 Welding vs. Brazing High gas velocities are important when welding. So you need to match the tip size to the material/joint. Brazing bicycle frames is different. Some builders, myself included, will build an entire frame, from fillets to braze ons, with a single, large tip. Just by varying gas flow with the valves. (Maybe using a bit more pressure than my usual 4-5psi for larger fillets.) I own every tip ever made for the Smith's AW1A , but I could get along just fine with just an AW205, which is big enough to weld 1/8" steel. Other builders get good results using a tip as small as an AW201 for braze ons.

Wire Drill Decimal Inch Smiths AW1A Little Torch Harris Victor Meco Midget Messer GCE Rhona Metric Eqiv. 97 0.0059 #2 0.15 85 0.011 #3 0.279 80 0.0135 #00 0.343 76 0.02 AW200 #4 0 00 00 0.508 75 0.022 0 #000 0.559 74 0.0225 AW20 0 0 0.572 73 0.5 0.572 71 0.026 AW201 1 1 1 0.66 70 0.028 #00 1 0.711 69 0.0292 AW202 #5 2 2 0.742 67 0.032 AW203 1.5 0.813 65 0.035 2 0 2 0.889 63 0.037 AW204 #6 2.5 2E 0.94 60 0.04 1 1.016 58 0.042 3 3 1.067 57 0.043 AW205 1.092 Wire Drill Decimal Inch Smiths AW1A Little Torch Harris Victor Meco Midget Messer GCE Rhona Metric Eqiv. 56 0.0465 AW206 #7 2 4 3 3 1.181 55 0.052 4 1.321 54 0.055 AW207 4.5 3.5 3E 1.397 53 0.0595 5 3 1.511 52 0.0635 AW208 5 4 4 1.613 51 0.067 6 1.702 49 0.073 AW209 4 5.5 4E 1.854 48 0.076 7 1.93 47 0.076 6 1.93 45 0.082 8 2.083 44 0.086 AW210 5 5 2.184 43 0.089 9 5 2.261 42 7 2.261 40 0.098 10 2.489 36 0.106 6 2.692 35 0.11 13 2.794 Wire Drill Decimal Inch Smiths AW1A Little Torch Harris Victor Meco Midget Messer GCE Rhona Metric Eqiv.

---

does this show up David

[HEATNBEAT]

by the chart it looks like the #5 that David uses is between our #00 & #000