SAW Electrical Systems & Wiring 3

Question 1

Voltage drop in the welding cable between the power source and the work clamp causes:

Accepted Answer

Reduced arc voltage at the weld and potential loss of penetration

Answer

Resistance in long or undersized cables causes voltage drop, reducing the actual arc voltage available at the weld joint.

Question 2

In SAW, the contact-tip-to-work distance (CTWD) affects the electrical circuit primarily by:

Accepted Answer

Altering the electrode extension resistance and thereby the effective heat input

Answer

Longer CTWD increases electrode extension resistance (I²R heating), reducing amperage and altering deposition characteristics.

Question 3

Which power source characteristic is best suited for SAW with a constant voltage (CV) system?

Accepted Answer

Flat (CV) volt-ampere curve

Answer

A flat CV characteristic maintains relatively constant voltage regardless of current changes, providing stable arc length control with a constant-speed wire feeder.

Question 4

What is 'arc blow' in the context of SAW electrical systems?

Accepted Answer

Deflection of the arc caused by magnetic fields in the workpiece or circuit

Answer

Arc blow is the deflection of the welding arc from its intended path due to asymmetric magnetic fields, common with DC welding on ferromagnetic materials.

Question 5

A SAW welder notices porosity increasing as cable length between the power source and work increases. The most likely electrical cause is:

Accepted Answer

Voltage drop causing reduced arc energy, leading to poor flux melting and gas entrapment

Answer

Voltage drop over long cables reduces arc energy, which can prevent complete flux melting and allow gases to become trapped in the weld.

(SAW) Submerged Arc Welding Certification Practice Test

(SAW) Submerged Arc Welding Certification Practice Test

SAW Electrical Systems & Wiring 3