Mixed Deck — All Certified Welder Topics Flashcards

What does 'flat position' mean in the context of groove welds?

Answer: The weld is made on a horizontal surface with the face up

In the flat (1G/1F) position, the weld is deposited on the upper side of a horizontal surface, allowing gravity to assist in controlling the weld puddle.

For which base metal is it most critical to use a dry, low-hydrogen SMAW electrode to prevent weld cracking?

Answer: High-strength, high-carbon, or alloy steel

High-strength and high-carbon steels are susceptible to hydrogen-induced (cold) cracking, making low-hydrogen electrodes essential.

Which welding process is commonly referred to as stick welding?

Answer: SMAW

SMAW stands for Shielded Metal Arc Welding, which is widely known as 'stick welding.' This process uses a consumable electrode coated in flux, which creates a shielding gas and slag to protect the weld puddle. It is a versatile and common welding method, especially for outdoor and field applications due to its portability and effectiveness in various conditions.

Which defect is most likely when welding a T-joint with insufficient root opening and travel speed that is too fast?

Answer: Lack of fusion or incomplete joint penetration

A tight root opening combined with excessive travel speed reduces heat input and prevents full fusion at the root, causing lack of fusion or incomplete penetration.

During radiographic testing, a linear indication parallel to the weld axis most likely represents:

Answer: Longitudinal crack or lack of fusion

Linear indications aligned with the weld axis on a radiograph typically indicate longitudinal cracks or planar lack-of-fusion defects.

A welder is preparing to qualify for a certification test that involves welding a pipe at a 45-degree fixed incline. This test is known to be one of the most comprehensive as it tests the welder's ability in all positions. What is this test position designation?

Answer: 6G

The 6G position requires welding a pipe that is fixed at a 45-degree angle. This complex position tests a welder's proficiency in all positions (flat, horizontal, vertical, and overhead) as they move around the joint. It is often used for welder performance qualification tests.

What does AWS A3.0 define?

Answer: Standard welding terms and definitions

AWS A3.0 is the Standard Welding Terms and Definitions, providing the official terminology used across all AWS standards.

A weld inspector notices the weld profile on a groove weld is convex and rises significantly above the base metal surface. This is most accurately described as:

Answer: Excessive reinforcement

Excessive reinforcement occurs when the weld crown projects too far above the base metal surface, potentially creating stress concentrations.

What is the minimum safe distance bystanders should maintain from arc welding operations without proper eye protection?

Answer: 50 feet

OSHA recommends bystanders stay at least 50 feet from arc welding operations or use appropriate shielding/screens to prevent arc flash injuries.

Which component in a GMAW setup controls the rate at which wire is fed to the welding gun?

Answer: The wire feed unit (wire feeder)

The wire feed unit drives the electrode wire from the spool to the welding gun at a speed set by the operator.

How should compressed gas cylinders be stored when not in use?

Answer: Upright and secured with chains or straps, caps installed

Cylinders must be stored upright, secured to prevent tipping, with protective caps installed, and separated by gas type and flammability.

What is the primary risk of allowing interpass temperature to rise excessively above the specified maximum?

Answer: Degraded mechanical properties due to grain growth and over-tempering

Excessive interpass temperature keeps the weld region at elevated temperatures too long, promoting grain growth and over-tempering that reduces yield strength and toughness.

During visual inspection, what condition describes weld metal that extends beyond the toe of the weld onto the base metal without fusing?

Answer: Cold lap

Cold lap (also called overlap) occurs when molten weld metal flows onto the base metal surface without fusing due to insufficient heat.

In pipe welding, the 6G position is considered the most difficult because it requires welding in how many positions?

Answer: Multiple — all positions around the inclined pipe

The 6G position has the pipe inclined at 45 degrees and fixed, requiring the welder to weld through flat, vertical, and overhead positions in one pass around the pipe.

Alternating weld passes on both sides of a joint to equalize shrinkage forces is known as:

Answer: Balanced welding

Balanced welding alternates passes symmetrically on both sides of the joint so that shrinkage forces cancel each other out, minimizing angular and longitudinal distortion.

When performing an oxy-fuel cut on carbon steel plate, the cut edge should be ground before welding primarily to remove:

Answer: Drag lines and hardened surface layer

Oxy-fuel cutting produces a hardened surface layer from rapid quenching and drag lines that can act as stress risers if not removed prior to welding.

When welding overhead, which additional PPE beyond standard helmet and gloves is most critical?

Answer: Leather cape and sleeves to prevent burn from falling spatter

Overhead welding causes hot spatter and slag to fall toward the welder, making full leather cape and sleeve coverage essential.

Tungsten inclusions in GTAW welds appear on a radiograph as:

Answer: Bright (light) irregularly shaped spots

Tungsten is denser than steel, so tungsten inclusions appear as bright (high-density) spots on a radiograph because they absorb more radiation than surrounding weld metal.

In oxyfuel welding, which flame type is used for welding most ferrous metals?

Answer: Neutral flame

A neutral flame, with balanced oxygen and acetylene, is used for most ferrous metal welding as it neither adds carbon nor oxidizes the weld.

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

Answer: Tri-mix (He/Ar/CO2)

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.