Certified Welder Welding Processes & Techniques 3

Question 1

When performing an uphill vertical weld with SMAW, the welder should use which technique to control the molten pool?

Accepted Answer

A weaving motion with brief pauses at the toes

Answer

Uphill vertical welding uses a weaving pattern with brief pauses at the toes to allow the puddle to fuse and prevent sagging.

Question 2

Which welding position is designated as '2G' according to AWS classification?

Accepted Answer

Horizontal groove weld

Answer

The '2G' designation indicates a horizontal groove weld position where the axis of the weld is horizontal.

Question 3

What is the purpose of a 'hot pass' in multi-pass pipe welding?

Accepted Answer

A pass immediately after the root pass to burn out inclusions and tie in the toes

Answer

The hot pass follows the root pass immediately, using higher heat to burn out trapped slag and gas and ensure proper fusion at the root.

Question 4

In GMAW, what effect does increasing wire feed speed have?

Accepted Answer

Increases welding current and increases heat input

Answer

In GMAW, the wire feed speed directly controls amperage; faster wire feed increases current draw and raises heat input.

Question 5

Which shielding gas is commonly used for GMAW of stainless steel to prevent carbide precipitation and improve arc stability?

Accepted Answer

Tri-mix (He/Ar/CO2)

Answer

A tri-mix of helium, argon, and a small percentage of CO2 is commonly used for stainless steel GMAW to provide good arc stability and prevent sensitization.

Certified Welder Practice Test

Certified Welder Practice Test

Certified Welder Welding Processes & Techniques 3