SEMI Auto 1
WHAT is an advantage of GMAW
Minimal post clean-up is required,It has a higher deposition rate,less heat in parent metal.
What is an advantage of the FCAW process?
High deposition rates and high deposition efficiency.Tubular electrodes are available for welding metals and alloys.
Which gas is used to reach spray transfer on carbon steel?
85%AR/15%CO2
What is the main disadvantage of cored wire processes
Fumes generated. Need to clean inter pass slag removal.Can be impaired by drafts.
Short circuit is best suited for welding on ?
Thin ferrous materials in all welding positions. For root passes of thicker materials.
What is an disadvantage of the GMAW process?
IT requires a shielding gas.
Which mode of metal transfer is the hottest?
SPRAY Transfer
What is an advantage of short circuit transfer?
It can weld poor fit up.
Which GMAW mode can be prone to incomplete fusion?
Short Circuit
Which GMAW process produces a high amount of splatter?
Globular transfer
What is the effect of increasing the background amperage in a pulse parameter?
IT increases arc stability.
The force in GMAW that detaches droplets from the electrode in short circuit . Name it
Pinch effect
What type of power source do you need to achieve modified short circuit transfer?
Inverter technology with waveform control.
What is an advantage using gas shielding FCAW process in globular mode? Name the gas
LOW COST CO2
Pulsed spray mode is used to weld what materials and why?
Thin materials and to control distortion.
Why is a push pull wire feed system used when welding with aluminum wire?
To prevent Kinking of the wire.
What is the function of the contact tip?
To transfer electrical current to the wire.
Adjusting slope can reduce this.
High amount of splatter
How do we measure gas flow on a flow meter.
Litres per minute or cubic feet per hour.
If you are welding with helium in a draft what must you be sure of in the welding process.
The gas does not blow away.
Which type of gas is used to weld aluminum?
Arrrrgon
A bird makes this and so can your wire feeder
Birds nest
Small amount of oxygen is added to the shielding gas to increase ?
heat input. weld penetration. and edge wetting
What is the effect of adding helium to an argon shielding gas when welding aluminum?
An increase in heat .
What is one problem when storing wire outside.
Moisture absorption