WCL Welding Processes & Techniques 4

Question 1

What is 'globular transfer' in GMAW and when does it typically occur?

Accepted Answer

Large irregular droplets that transfer across the arc, often with spatter, at intermediate voltage/amperage

Answer

Globular transfer produces large, irregular molten droplets that fall across the arc under gravity, causing significant spatter at intermediate voltage settings.

Question 2

In submerged arc welding (SAW), what function does the granular flux serve?

Accepted Answer

It shields the arc and weld pool from atmosphere, and can add alloying elements to the weld

Answer

In SAW, the granular flux blankets the arc and molten pool to provide atmospheric shielding and can contribute alloying elements to the weld metal.

Question 3

What does 'stringer bead' mean in welding technique?

Accepted Answer

A narrow bead deposited by moving the electrode straight along the joint with little or no weaving

Answer

A stringer bead is deposited by moving the electrode along the joint in a straight line without lateral weaving, producing a narrow, consistent bead.

Question 4

Which type of joint is created when two pieces of metal are placed end-to-end in the same plane and welded?

Accepted Answer

Butt joint

Answer

A butt joint is formed when two pieces are placed end-to-end in the same plane and welded along their edges.

Question 5

What is the significance of the 'duty cycle' rating on a welding power source?

Accepted Answer

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

Answer

Duty cycle indicates the percentage of a 10-minute period a machine can operate at its rated output before needing to cool down to prevent overheating.

(WCL) Welding Certification Los Angeles Practice Test

(WCL) Welding Certification Los Angeles Practice Test

WCL Welding Processes & Techniques 4