What is the minimum shade number for an arc welding helmet filter lens recommended by ANSI Z49.1 for shielded metal arc welding (SMAW) at 60-160 amps?
Welding Safety
Question · Medium
How long must a fire watch remain at the welding area after hot work is completed, per NFPA 51B and OSHA 1910.252?
Question · Easy
Which gas produced during welding can displace oxygen in confined spaces and cause asphyxiation?
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What is the primary hazard of welding on galvanized (zinc-coated) steel without proper ventilation?
What color identifies an oxygen hose used in oxyfuel cutting?
Oxyfuel Cutting
What is the maximum working pressure for acetylene, and why is this limit critical?
Which flame type is used for most oxyfuel cutting operations on carbon steel?
What is the proper sequence for shutting down an oxyfuel cutting torch?
What is a backfire in oxyfuel cutting, and what is the immediate corrective action?
What is the purpose of a flashback arrestor on an oxyfuel system?
Which cutting process uses an ionized gas stream at temperatures up to 40,000°F to sever metal?
Plasma Arc Cutting
Which of the following metals CANNOT be cut effectively with oxyfuel cutting but CAN be cut with plasma arc cutting?
What is the primary purpose of air carbon arc cutting (CAC-A) in welding fabrication?
Cutting Processes
What is the minimum compressed air pressure typically required for air carbon arc gouging at 80-100 psi at the source?
What is the recommended bevel angle for a single V-groove butt weld on carbon steel plate per AWS D1.1?
Base Metal Preparation
What is the term for the unwelded portion at the bottom of a groove weld preparation, between the root face and the root opening?
Why is mill scale removed from the weld joint before welding?
What is the AWS A3.0 definition of a 'fillet weld'?
Weld Types And Joints
What are the five basic joint types recognized by AWS?
What does the AWS designation '1G' indicate for a groove weld test?
Welding Positions
Which welding position is generally considered the most difficult to perform?
What does '6G' indicate in pipe welding qualification?
What does '5G' indicate in pipe welding qualification?
What is the meaning of the SMAW electrode classification 'E7018'?
Smaw Process
What is the meaning of the '1' in the SMAW electrode designation E6010?
Why must E7018 low-hydrogen electrodes be stored in a heated rod oven?
What does DCEP (Direct Current Electrode Positive) mean, and what is its effect in SMAW?
Which polarity is typically used for GTAW (TIG) welding of carbon steel and stainless steel?
Gtaw Process
Why is AC used for GTAW (TIG) welding of aluminum?
Question · Hard
What shielding gas is used for GTAW (TIG) welding of carbon and stainless steels?
What is the most common shielding gas mixture for short-circuit GMAW (MIG) welding of carbon steel?
Gmaw Process
What shielding gas is used for GMAW (MIG) welding of aluminum?
What are the four GMAW (MIG) metal transfer modes?
Which GMAW transfer mode is used for out-of-position (vertical and overhead) welding of thin material?
What does the GMAW wire designation 'ER70S-6' indicate?
What is the primary difference between FCAW-S (self-shielded) and FCAW-G (gas-shielded)?
Fcaw Process
Why is FCAW commonly preferred over SMAW for structural steel fabrication?
What is the typical electrode angle (work angle) for a fillet weld in the 1F (flat) position?
Weld Technique
What is undercut in a finished weld?
Weld Quality
What welding discontinuity is caused by gas being trapped in the weld metal as it solidifies?
What discontinuity occurs when nonmetallic material from the flux becomes trapped in the weld metal?
What is 'lack of fusion' (LOF) in a weld?
Which nondestructive test (NDT) method uses radiation to detect internal weld defects?
Which NDT method is best for detecting tight surface and slightly subsurface cracks in ferromagnetic materials?
Which NDT method uses high-frequency sound waves to detect internal defects?
According to AWS A2.4, what does the welding symbol fillet weld with '1/4' to the left of the symbol indicate?
Welding Symbols
On an AWS welding symbol, what does it mean when the weld symbol is placed BELOW the reference line?
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