Weld 200A SMAW op
What is the purpose of flux?
1) gaseous cloud 2) slag / cooling 3) helps stabilize the arc 4) deposits elements that benefit the weld
what are the ways to change polarity?
1) levers 2) twist locks 3) lugs (switch either twist locks or lugs if levers aremt present)
what are the 5 ways to mitigate arc blow?
1) move ground and reposition 2) weld in the opposite direction 3) back step 4) weld from inside corners 5) degause 6) extend the part
what are the 3 symptoms of arc blow?
1) spatter 2) Erratic long arc 3) progressively worsens at the end of weld
What are the current types?
Alternating current (AC) Direct current (DC)
What is Alternating Current (AC)?
Alternating current (AC) is a current type that has NO POLARITY and cycles 60x per second and changes direction 120x per second.
what is arc blow?
Arc blow refers to the deflection or deviation of the welding arc from its intended path.
What are the two types of power supply/ power source?
Constant Current (CC) (manual) Constant Voltage (CV) (semi-auto)
What are the types of Polarity for (DC)?
DCEN -> straight polarity DCEP -> reverse polarity
What is Direct current (DC)?
Direct current (DC) is a current type that flows from (-) to (+) and has 2 types of polarities. it does NOt change direction!
What are the semi-auto arc welding processes?
FCAW & GMAW (CV)
What are the manual arc welding processes?
SMAW & GTAW (CC)
What is SMAW?
SMAW is a manual process that requires CC (constant current) power supply. uses an electrode known as flux.
what is the duty cycle?
Tells us how long a weldinG machine can run in a 10 min. period at its RATED OUTPUT
What is Arc welding?
arc welding is the process of using an electric arc to melt base metals and filler metal instead of flame. (FCAW,GMAW,SMAW,GTAW)
to know the polarity you must know the __________
consumable
what is voltage (v)?
pressure
why is the duty cycle important?
reflects the usability of the machine
what is the cause of arc blow?
the cause of arc blow is magnetic interference / deflection of the arc
What is the relationship between voltage (v) and Amperage (A)
the relationship between voltage and amperage is inverse. when (A) goes up, (V) goes down and vice versa.
what is a travel angle?
the travel angle is the direction of the weld
what is the work angle?
the work angle is perpendicular to the axis of the weld
Ways to determine which Polarity and current to use:
to determine which polarity and current to use it depends on the consumable
what is amperage (a)?
volume, heat, current
