100+ Free AWS CRWT Practice Questions

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Question 1

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In resistance welding, heat is generated primarily by which physical principle?

Arc plasma radiation at the electrode tip

Joule heating (I squared R t) as current passes through the workpieces

Induction heating from an external coil

Friction between the electrodes and the sheet

to track

2026 Statistics

Key Facts: AWS CRWT Exam

100 Qs

Scored Questions

Plus 10 unscored

135 min

Time Limit

Closed-book

60%

Passing Score

Minimum

$445/$590

Exam Fee

Member / non-member

AWS C1.1

Primary Reference

Plus D8 series, RWMA

5 years

Validity

Recertify by reexam

The AWS CRWT exam has 100 scored multiple-choice questions (plus 10 unscored pre-test items) with a 135-minute time limit in closed-book format. You must score at least 60 percent to pass. The exam is based on AWS C1.1M/C1.1 (Recommended Practices for Resistance Welding), AWS C1.4, AWS QC20, the AWS D8 automotive series (D8.1, D8.6, D8.9), the RWMA Resistance Welding Manual, and ANSI Z49.1 safety. Exam fee is $445 for AWS members and $590 for non-members, testing is at Prometric, and the credential is valid for 5 years (recertify by reexamination).

Sample AWS CRWT Practice Questions

Try these sample questions to test your AWS CRWT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In resistance welding, heat is generated primarily by which physical principle?

A.Arc plasma radiation at the electrode tip

B.Joule heating (I squared R t) as current passes through the workpieces

C.Induction heating from an external coil

D.Friction between the electrodes and the sheet

Explanation: Resistance welding relies on I squared R t heating — current squared times bulk and interface resistance times weld time — with the highest resistance (and thus heat) at the faying surface between the sheets. This is why the nugget forms at the sheet-to-sheet interface rather than at the electrode face. AWS C1.1M/C1.1 Section 3 describes this fundamental heat balance. Exam tip: Remember heat is proportional to the SQUARE of current, so a 10 percent current change produces roughly a 21 percent change in heat input.

2According to AWS C1.1M/C1.1, which location in a resistance spot weld stack-up typically has the highest resistance at the start of the weld cycle?

A.Bulk resistance of the upper sheet

B.Bulk resistance of the lower sheet

C.Faying (sheet-to-sheet) interface

D.Electrode shank resistance

Explanation: At the start of the weld, the sheet-to-sheet (faying) interface has the highest contact resistance because of surface films, asperities, and limited real contact area. As the sheets heat and soften, that contact resistance collapses and bulk resistance dominates. AWS C1.1M/C1.1 Section 4 uses this shift to explain why nugget formation starts at the interface. Exam tip: Interface resistance falls quickly in the first few cycles — modern weld schedules use preheat/squeeze to control this.

3The three primary process variables that define a resistance spot welding schedule are:

A.Voltage, gas flow, and wire feed

B.Current, electrode force, and weld time

C.Travel speed, arc length, and polarity

D.Preheat, interpass, and post-weld heat temperatures

Explanation: A resistance spot weld schedule is defined by welding current, electrode force, and weld time — the three controllable variables a technician adjusts to produce an acceptable nugget. These are the axes of the weld lobe diagram in AWS C1.1M/C1.1 Section 5. Exam tip: Memorize these three — virtually every CRWT process question traces back to one of them.

4On a resistance spot welding lobe diagram, the two axes plotted are usually:

A.Electrode force versus electrode diameter

B.Welding current versus weld time

C.Voltage versus travel speed

D.Hold time versus squeeze time

Explanation: A weld lobe diagram plots welding current on one axis and weld time on the other at a fixed electrode force and material stack-up. The bounded region shows the combinations that yield acceptable nuggets between undersize (low end) and expulsion (upper end). AWS C1.1M/C1.1 Section 5 shows typical lobes. Exam tip: A wide lobe means a robust process — more tolerant of current or time drift.

5The upper boundary of a resistance spot weld lobe is generally defined by:

A.The smallest acceptable nugget diameter

B.The onset of expulsion (molten metal ejection)

C.Minimum electrode life of 2,000 welds

D.The melting point of the electrode copper alloy

Explanation: At the upper-current/upper-time edge of the lobe, additional heat causes expulsion — molten metal is forcibly expelled from the weld, producing porosity, shallow nuggets, and poor appearance. The lower boundary is the minimum acceptable button size. AWS C1.1M/C1.1 Section 5 uses these limits to define the operating window. Exam tip: If expulsion is routine, the process is running at or beyond the upper lobe boundary.

6During a standard resistance spot weld cycle, what is the purpose of squeeze time?

A.To preheat the workpieces before current flows

B.To allow the electrodes to seat and reach full force before current starts

C.To slowly cool the nugget after current stops

D.To dress the electrode face between welds

Explanation: Squeeze time is the interval between the start of electrode closure and the start of welding current. It lets the electrodes fully seat on the work and allows the pneumatic/servo actuator to build up to full set-point force before current flows — critical for stable contact resistance. Exam tip: Insufficient squeeze time is a common cause of early-weld expulsion because the electrodes have not built force when current starts.

7Hold time in a resistance spot welding cycle is defined as the interval:

A.Between the end of current flow and the release of electrode force

B.Between the start of squeeze and the start of current

C.Between successive welds on a moving part

D.Between electrode dressings

Explanation: Hold time keeps the electrodes clamped on the workpiece AFTER the current stops, allowing the nugget to solidify under forging force. This forging action reduces solidification cracking, porosity, and shrinkage voids. Too much hold time can quench the nugget and promote cracking in hardenable steels. Exam tip: On hardenable steels, shortening hold time is one common fix for HAZ cracking.

8For a single-phase AC resistance welding machine, weld time is most commonly expressed in:

A.Seconds

B.Milliseconds

C.Cycles (at 60 Hz, 1 cycle equals 1/60 second)

D.Nanoseconds

Explanation: Single-phase AC resistance welders operate at the line frequency (60 Hz in North America), so weld schedules are specified in cycles. One cycle equals 1/60 second (about 16.7 ms). A typical automotive spot weld on mild steel might be 8 to 15 cycles. Exam tip: MFDC machines are programmed in milliseconds, so know which units apply to the machine you are troubleshooting.

9A mid-frequency direct current (MFDC) resistance welder typically operates at a DC output frequency around:

A.60 Hz

B.400 Hz

C.1,000 Hz (1 kHz)

D.100 kHz

Explanation: MFDC welders use an inverter that chops the line supply at roughly 1,000 Hz and then rectifies it to a smooth DC output at the secondary. Benefits include smaller transformers, three-phase balanced load, faster current rise, and tight control. RWMA literature and AWS C1.1M/C1.1 both describe MFDC advantages over single-phase AC. Exam tip: If a gun cable is short and fast response is needed (robotic body-in-white), MFDC is almost always the pick.

10Compared with a single-phase AC machine of equivalent secondary current, an MFDC welder generally produces:

A.A much larger secondary transformer for the same kVA

B.A three-phase balanced line load and smaller transformer size

C.Only half-wave current unsuitable for aluminum

D.No current control capability

Explanation: MFDC inverters draw balanced three-phase power, which evens the load on the plant and removes the line imbalance caused by single-phase welders. The higher operating frequency also lets the transformer be much smaller and lighter — a key benefit for robotic guns. Exam tip: For long secondaries on robots, MFDC also cuts inductive losses and improves repeatability.

About the AWS CRWT Exam

The AWS Certified Resistance Welding Technician (CRWT) is the American Welding Society credential for professionals who design, set up, operate, or troubleshoot resistance welding lines and cells. The exam covers resistance spot, projection, seam, flash, upset, and high-frequency resistance welding, along with RWMA electrode classes, weld lobes, dynamic resistance, destructive testing, and safety. It is administered at Prometric test centers on behalf of AWS and is widely recognized in automotive body-in-white, appliance, and sheet metal fabrication industries. The credential is valid for five years and must be recertified by reexamination.

Questions

100 scored questions

Time Limit

135 minutes

Passing Score

60%

Exam Fee

$445 member / $590 non-member (American Welding Society (Prometric))

AWS CRWT Exam Content Outline

20%

Resistance Welding Fundamentals

I squared R t heating, contact and dynamic resistance, weld cycle (squeeze/weld/hold/off), weld lobes, upslope/downslope, pulsation per AWS C1.1M/C1.1

20%

Equipment, Power Sources, and Controls

AC vs MFDC machines, transformers, SCR firing, constant-current control, duty cycle, secondary loop impedance, pedestal/portable/servo guns, NEC Article 630

18%

Electrodes, Tooling, and Fixturing

RWMA Classes 1 to 20, electrode geometry and face diameter, water cooling, tip dressing, cap change schedules, fit-up and fixturing

10%

Process Variations

Spot, projection, seam, flash, upset, and high-frequency resistance welding processes and applications

17%

Weld Quality, Testing, and Inspection

Button diameter (4 times square root of t), peel, chisel, pry, torsion, tension-shear, cross-tension, macroetch, indentation, and ultrasonic inspection per AWS D8.9

10%

Materials and Troubleshooting

Mild steel, galvanized, AHSS, third-gen AHSS, aluminum, dissimilar thicknesses, expulsion, stick welds, shunting, mushrooming, and cracking

Safety and Standards

Pinch points, eye protection, EMF, LOTO, fumes (zinc oxide), ANSI Z49.1, NEC Article 630, AWS C1.1/C1.4/D8 series and QC20 references

How to Pass the AWS CRWT Exam

What You Need to Know

Passing score: 60%
Exam length: 100 questions
Time limit: 135 minutes
Exam fee: $445 member / $590 non-member

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

AWS CRWT Study Tips from Top Performers

1Memorize the weld cycle components cold — squeeze, weld (current on), hold (forging under force, no current), and off time. AWS C1.1 Section 5 describes each; hold time too long on hardenable steels causes HAZ cracking, too short causes porosity

2Know the minimum spot weld button diameter rule — roughly 4 times the square root of the thinner sheet thickness in millimeters, per AWS D8.1M and D8.9M. A 1.0 mm + 1.0 mm stack target is about 4 mm; failure must be button-pull, not interfacial

3Learn RWMA electrode classes — Class 2 (chromium copper) for uncoated steel, Class 20 (dispersion-strengthened copper) for galvanized steel, Class 1 (pure copper) for non-ferrous at lower load. RWMA Bulletin 5 catalogs geometries

4Understand dynamic resistance curves — smooth initial drop then plateau indicates good nugget formation; a sharp mid-weld drop that does not recover is the classic expulsion signature. AWS C1.1 Section 8 shows reference traces

5Study the AWS D8 family — D8.1M for automotive RSW practices, D8.6 for aluminum, D8.7 for friction-stir/resistance stud welding, D8.9M for test methods (peel, chisel, pry, tension-shear, cross-tension, macroetch). Know which document answers which question

Frequently Asked Questions

What score do I need to pass the AWS CRWT exam?

You must score at least 60 percent on the 100 scored questions to pass the AWS CRWT exam. Ten additional unscored pre-test items are mixed in and do not count toward your score, but you will not know which items are scored, so answer every question carefully. AWS releases pass/fail results through the Prometric system and provides a diagnostic breakdown if you do not pass so you know which domains to restudy for your next attempt.

Is the AWS CRWT exam open-book or closed-book?

The CRWT exam is closed-book. You may not bring AWS C1.1, the RWMA Resistance Welding Manual, or any notes into the Prometric testing room — only items issued by the test center. That means you must memorize key formulas (I squared R t heating, minimum button diameter of roughly 4 times the square root of the thinner sheet thickness in mm), typical current and force ranges, RWMA electrode classes, and the basic safety requirements from ANSI Z49.1. Plan your study time accordingly.

How hard is the CRWT exam?

The CRWT is moderately challenging. The hardest areas are usually weld lobe interpretation, dynamic resistance signatures, RWMA electrode class selection on coated steels and AHSS, and destructive test acceptance criteria per AWS D8.9. Candidates with hands-on automotive body-in-white experience typically pass on the first attempt. Technicians coming from a more general welding background should budget 80 to 120 hours of study and focus on the AWS C1.1M/C1.1 body of knowledge.

Which reference standards does the CRWT exam use?

The CRWT body of knowledge is built on AWS C1.1M/C1.1 (Recommended Practices for Resistance Welding), AWS C1.4 (Automotive Portable Gun Resistance Spot Welding), AWS QC20 (Certification Program Specification), the RWMA Resistance Welding Manual, and the AWS D8 automotive series (D8.1M for practices, D8.6 for aluminum, D8.9M for test methods). You also need basic familiarity with AWS A3.0 welding terms, ANSI Z49.1 safety, and NEC Article 630 for welder electrical installations.

What jobs can I get with AWS CRWT certification?

CRWT certification qualifies you for resistance welding technician, process engineer, quality engineer, weld schedule developer, and line supervisor roles at automotive OEMs, Tier 1 suppliers, appliance manufacturers, and sheet metal fabricators. Typical salaries range from $60,000 to $100,000 depending on region and experience. CRWT holders frequently pair the credential with AWS CWI or CWS for broader career mobility into inspection and supervision.

How do I prepare for the AWS CRWT exam?

Start with AWS C1.1M/C1.1 and the RWMA Resistance Welding Manual to master fundamentals, the weld cycle, lobe diagrams, and electrode classes. Work through AWS D8.1M and D8.9M for automotive practices and test methods. Practice calculating button diameter, identifying defect causes, and interpreting dynamic resistance plots. Take the AWS 2-day CRWT seminar if available, and run at least three timed 100-question mock exams to build pace.