CSWIP 3.1 WELDING PROCESSES

PART 4.png

Key notes:

General:

Typical H.I from 1 – 3.5 kJ/mm

111.png

Plastic state welding or Non-fusion welding

spswksep99f10.jpg
Friction welding

CC or CV

31.png

Polarity and Penetration ability

32.png

Operation Factor vs Duty Cycle 

34.png

Affection of Torch Angle

1Q.png

MMA:

  • Typical OCV : 50-90V and Operation range : 20-40V
  • Arc blow because of Magnetic force (DC) –> Prevent by using AC
  • Run Out Length (ROL) –> For measuring the welding Speed

TIG:

  • Typical OCV : 50-90V and Operation range : 20-40V
  • Filler rod – consumables vs Electrode – nonconsumable
  • HF – high frequency  Arc starting can Damage the equipments
  • AC used for Al and Mg (Because of Best Cleaning action)
  • Electrode extension increase/decrease will make Tungsten contamination/Un-stable Arc
  • Water cooled applied when Current over 150A
  • Slop-in/Slop-out for preventing Tungsten contamination/ Crater crack
  • Autogenous welding can cause porosity because no have de-oxidizer 

GMAW (MIG/MAG):

  • WFS & Current directly related to Burn-off Rate
  • WFS changes will affect directly to Current
  • Globular transfer normal use in Mechanized MAG (CO2)
  • Dip mode transfer machine will use inductance add
  • MIG used for Al or Non-ferrous welding.
  • Dip transfer mode cause LOF
  • Spray transfer mode use for thicker joint (>25mm) and PA/PB/PC position only.
  • Pulse transfer mode adjust the Peak Current / Back Current

FCAW:

  • Always used with Spray transfer mode
  • Deposition rate of Flux core HIGHER than Solid core

SAW:

  • Highest duty cycle ~ 90-100%
  • No UV light during operation
  • Can operate with CC if Current > 1000A, use AC to prevent Arc Blow
  • Transformer control directly the OCV
  • Twin wire – One power source vs Twin wire – Two power sources (TANDEM)

35.png

 

One thought on “CSWIP 3.1 WELDING PROCESSES

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s