Halton Auto
Mike Tew
Welding Power Point
Oxygen
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Regulator Pressure 20PSI- 35PSI
Tall Green Tanks
Power behind the flame
High Pressure
Tank volume 2500PSI
Acetylene
• Regulator Pressure 4-5 PSI
• Tanks must stay standing up. If lose of acetone,
pressures can become unstable
• Red small tank
• Lighting fuel
• Low pressure
• Tank volume 250PSI
• 21 PSI is when it
Becomes the danger zone
Safety First
Dangers
Changing tips
• Welding tip
• Demo
• Cutting tip
• Demo
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Never tighten tip on with a wrench
Hand tight
No oil, grease or lube
Cutting tip handle (tip nut) must be tightened with wrench
• Flash backs at handles not at tanks (will not allow flash back to
destroy lines)
Cutting and Welding
Checking for leaks
• Order the proper torch solvent to check for leaks
• Never use soap and water
• Soap contains oils and can make the tanks
dangerous
• Turn thanks on (handles off) prime lines
• Close tank valves (leave lines primed for 20-45
mins)
• If regulator pressures drops you have a leak
• Spray and check for bubbles
Lighting and shut down
• A before O or up you can go
• When the torches are shut down like this you
reduce the chance of having the high pressure
gas rush back on the low pressure gas creating an
unstable mixture
• Demo
Neutral Flame
• 5000 plus degree (neutral flame)
• Metal melts at 2500 degree
• Kindeling temp 1400 degree (ignition temp)
Cutting
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To properly cut the material needs Iron
Cutting is really Oxidizing
Keep tips clean
Dangers
Oxy (high pressure gas) has the possibility to push
back up the Acet (low pressure gas) making it
become unstable.
• Don’t rest tip on material when cutting
• Hissing sound is bad (to hot oxidizing flame)
Brazing
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A-O
Equal pressures 7 Acet – 7 Oxy (neutral flame)
Light Acet, till smoke crisps
Add Oxy
Flame temp 5000 plus degree
Perg lines every time
Mig
Welding Basic Set ups
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Weld by sound (bacon and eggs)
Too little Amps gun will pop
Too much volts gun will burn wire in tip
Too find the proper relationship start with AMPS
HIGH and bring it down to a proper buzz
• Tip 45 Degree 4mm of material
• Never perg you mig gas (leave in line, so moisture
can not rust inside liner)
Polarity
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Flow of current
- to + Straight line (DCSP)
+ to – Reverse line (DCRP)
Know what % is in your hand
Mig 70% + to – (DCRP)
Tig the ground (materile) melts (DCSP)
Toungston is in hand (-) 30%
Stick + to - (hand melts)
AC machines are junk
DCSP
Mig DCRP
TIG