Resistance Welding Tech Prep Exam Questions & Answers 2026 (21–30)

Question 1

Which weld quality test involves applying a tensile force parallel to the weld interface?

TheoryPractice · Accepted Answer

Shear test. A shear test applies tensile force parallel to the weld interface to determine the shear strength of the weld, which is critical for many load-bearing applications.

Question 2

What does an interfacial failure in a spot weld destructive test indicate?

TheoryPractice · Accepted Answer

Inadequate nugget size or improper weld parameters. An interfacial failure, where the weld fractures through the middle of the nugget, often indicates inadequate nugget size, improper welding parameters, or material incompatibility issues.

Question 3

According to AWS standards, what is typically considered the minimum acceptable tensile-shear strength for a spot weld?

TheoryPractice · Accepted Answer

4,000 × t pounds (where t is thickness in inches). According to AWS standards, the minimum acceptable tensile-shear strength is typically specified as 4,000 × t pounds (where t is the thickness in inches of the thinner sheet).

Question 4

Which non-destructive testing method for spot welds uses sound waves to detect discontinuities?

TheoryPractice · Accepted Answer

Ultrasonic testing. Ultrasonic testing uses high-frequency sound waves that reflect differently from weld defects, allowing detection of discontinuities without damaging the weld.

Question 5

What is the primary cause of internal porosity in resistance spot welds?

TheoryPractice · Accepted Answer

Trapped gases from surface contaminants. Internal porosity is primarily caused by trapped gases (often from surface contaminants like oils, greases, or coatings) that cannot escape the molten nugget during solidification.

Question 6

Which method is best for determining the hardness profile across a resistance weld?

TheoryPractice · Accepted Answer

Microhardness testing. Microhardness testing allows for precise measurement of hardness at multiple points across the weld, including the base metal, heat-affected zone, and weld nugget.

Question 7

What is the primary limitation of visual inspection for resistance spot welds?

TheoryPractice · Accepted Answer

Cannot detect internal defects. Visual inspection is limited because it can only detect surface defects, while most critical defects in resistance spot welds are internal and not visible from the surface.

Question 8

Which defect is characterized by cracks at the edge of the weld nugget?

TheoryPractice · Accepted Answer

Circumferential cracking. Circumferential cracking occurs at the edge of the weld nugget, often due to rapid cooling rates, improper heat balance, or excessive electrode force.

Question 9

What is the recommended frequency for performing destructive tests on production spot welds according to most quality standards?

TheoryPractice · Accepted Answer

Periodically (typically daily or per shift). Most quality standards recommend periodic destructive testing (typically daily or at shift changes) to verify weld quality, with frequency increasing for critical applications or when process changes occur.

Question 10

What is the primary purpose of water cooling in resistance welding electrodes?

TheoryPractice · Accepted Answer

To prevent electrode overheating and extend electrode life. Water cooling in resistance welding electrodes prevents overheating and extends electrode life by removing heat generated during the welding process, which helps maintain consistent electrode face geometry and prevents excessive mushrooming.

Resistance Welding Tech Prep Exam Questions & Answers 2026 (21–30)

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