AWS AWS Welding Processes & Equipment 2

Question 1

What does 'duty cycle' mean for a welding power source?

Accepted Answer

The percentage of a 10-minute period that the machine can operate at a rated amperage without overheating

Answer

Duty cycle is the percentage of a 10-minute period (or sometimes 100 seconds in some standards) a machine can weld at its rated output without exceeding temperature limits.

Question 2

In GMAW, 'short-circuit transfer' (short-arc) metal transfer is best suited for:

Accepted Answer

Thin gauge material and out-of-position welding at low heat input

Answer

Short-circuit transfer uses low voltage and amperage, producing a small, fast-freezing weld pool ideal for thin material and out-of-position welding.

Question 3

Which polarity is used with an E6010 SMAW electrode for maximum penetration?

Accepted Answer

DCEP (direct current electrode positive)

Answer

E6010 uses DCEP (reverse polarity), which concentrates 2/3 of the heat at the electrode and provides deep penetration.

Question 4

What is the purpose of 'wire feed speed (WFS)' in GMAW?

Accepted Answer

It controls the rate at which electrode wire is fed to the arc, which determines amperage

Answer

Wire feed speed determines how fast the consumable wire is fed into the arc, which in turn controls the welding current (amperage).

Question 5

A 'constant voltage (CV)' power source is primarily used with which welding process?

Accepted Answer

GMAW and FCAW

Answer

Constant voltage (CV) power sources are designed for continuous wire feed processes like GMAW and FCAW, providing self-regulation of arc length.

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AWS AWS Welding Processes & Equipment 2