@Hello-Audience

Why is Gas Metal Arc Welding (GMAW) preferred over Submerged Arc Welding (SAW) for joining thick (25 mm) aluminum plates when high deposition is required?

A.
SAW provides insufficient penetration for such thick material.

B.
The flux used in SAW cannot effectively remove the stable aluminum oxide layer and can introduce moisture.

C.
GMAW is a solid-state process and causes less distortion.

D.
GMAW equipment is significantly cheaper and more portable than SAW equipment.

2 months ago | [YT] | 0

@Hello-Audience

What is the most likely cause of scattered porosity in a GMAW weld when a high-quality shielding gas is used?

A.
High welding current and travel speed.

B.
Incomplete cleaning of the base metal (e.g., rust, oil, or excessive mill scale).

C.
Too low a wire feed speed.

D.
Using a Constant Current (CC) power source instead of a Constant Voltage (CV) power source.

2 months ago | [YT] | 0

@Hello-Audience

In a T-joint, a welding symbol shows a staggered intermittent fillet weld. If the dimension on the reference line is '1/2' and the dimension to the right is '3-6', what is the distance from the center of one weld segment to the center of the next weld segment on the same side?

A.
3 inches

B.
9 inches

C.
6 inches

D.
1/2 inch

2 months ago | [YT] | 0

@Hello-Audience

A shielded metal arc welding (SMAW) electrode has an AWS classification of E9018-H4R. What does the 'R' designator at the end signify?

A.
The electrode can be re-baked without losing its low-hydrogen properties.

B.
The electrode is suitable for welding in the Root position only.

C.
The electrode uses a rutile-based coating for faster travel speed.

D.
The electrode meets the requirement for resistance to moisture reabsorption.

2 months ago | [YT] | 0

@Hello-Audience

A Gas Metal Arc Welding (GMAW) operation uses a 1.2 mm diameter steel wire with a density of 7.85 g/cm$^3$. The wire feed speed is 10 m/min. What is the approximate deposition rate in kg/hour?

3 months ago | [YT] | 0

@Hello-Audience

What is the primary reason for the formation of 'sigma phase' in stainless steel welds, and what is its effect on mechanical properties?
A.
It is a brittle intermetallic phase that forms due to prolonged exposure to high temperatures (e.g., in the HAZ), leading to a loss of toughness and corrosion resistance.
B.
It is a beneficial grain-refined structure that improves the strength and ductility of the weld.
C.
It is a martensitic structure that increases strength and hardness.
D.
It is a ductile phase that improves the fatigue life of the weld.

3 months ago | [YT] | 0

@Hello-Audience

Which of the following is the primary cause of solidification cracking in a weld, and which elements typically increase its susceptibility?

A. The formation of brittle martensite in the Heat-Affected Zone (HAZ).
B. Improper torch angle and excessive travel speed.
C. The presence of low-melting-point impurities like sulfur and phosphorus that form liquid films along grain boundaries during solidification.

3 months ago | [YT] | 0

@Hello-Audience

Which of the following is an example of an adhesive bonding process?

A.

Brazing

B.

Epoxy bonding

C.

Spot welding

D.

Soldering

3 months ago | [YT] | 0

@Hello-Audience

Which of the following would lead to an increase in the welding arc voltage in a Gas Metal Arc Welding (GMAW) process with a Constant Voltage (CV) power source?
A.
Increasing the travel speed.
B.
Increasing the wire feed speed.
C.
Increasing the wire stick-out (the distance from the contact tip to the workpiece).
D.
Decreasing the shielding gas flow rate.

3 months ago | [YT] | 0

@Hello-Audience

In the AWS designation for an SMAW electrode, what does the 'H4' supplemental designator indicate, if present?

3 months ago | [YT] | 0