100+ Free CSLB C-60 Practice Questions

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2026 Statistics

Key Facts: CSLB C-60 Exam

28%

Welding, Brazing & Soldering

CSLB Study Guide

22%

Safety & Preparation

CSLB Study Guide

3.5

Hours allowed

PSI Exams

$450

Application Fee

CSLB

4 Years

Experience Req

CSLB

The CSLB C-60 Welding examination is a 3.5-hour closed-book, multiple-choice test administered by PSI. It requires 4 years of journey-level experience and a $450 application fee. The exam covers planning, welding preparation, welding/brazing/soldering, cutting processes, and safety.

Sample CSLB C-60 Practice Questions

Try these sample questions to test your CSLB C-60 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A job requires 3 tons of structural steel. The supplier charges $42 per 100 pounds. What is the total cost?

A.$2,520

B.$2,100

C.$1,890

D.$2,940

Explanation: 3 tons equals 6,000 pounds. At $42 per 100 pounds, the rate applies 60 times (6,000 ÷ 100), giving a total of 60 × $42 = $2,520.

2What is the minimum steel thickness covered by AWS D1.1 Structural Welding Code – Steel?

A.1/8 inch

B.1/16 inch

C.3/16 inch

D.1/4 inch

Explanation: AWS D1.1 applies to structural steel welding for material 1/8 inch and thicker. Thinner sheet steel is governed by other standards such as AWS D1.3.

3When spark-testing an unknown metal with a grinder, mild steel produces sparks that are:

A.moderate in volume with relatively few forks

B.short, dull red, and dart-shaped with no forking

C.long, dense, and heavily forked

D.very short with almost no spark stream

Explanation: Mild steel spark testing produces a moderate volume of sparks with relatively few forked streaks. Cast iron gives short dull red sparks; high-carbon steel produces dense, heavily forked streams.

4According to AWS A2.4, when a weld symbol is placed above the reference line, the weld is to be made on the:

A.arrow side of the joint

B.other side of the joint

C.both sides of the joint

D.either side at the welder's discretion

Explanation: AWS A2.4 places arrow-side information BELOW the reference line and other-side information ABOVE it, so a symbol above the line calls for the weld on the face opposite the one the arrow touches. This holds no matter which end of the reference line the arrow attaches to or how the arrow is angled. It is the reverse of the ISO convention, which is a common source of shop errors.

5A 4 ft by 8 ft sheet of 1/4 inch steel plate weighs approximately how much? (Steel at 1/4 inch weighs about 10.2 lb/ft².)

A.326 pounds

B.245 pounds

C.408 pounds

D.163 pounds

Explanation: A 1/4 inch steel sheet weighs about 10.2 lb/ft². The sheet is 4 × 8 = 32 ft², so 32 × 10.2 ≈ 326 pounds.

6On a welding symbol, a flag at the junction of the arrow and reference line indicates:

A.a weld made in the field (not in the shop)

B.a weld applied all the way around the joint

C.a flush contour weld

D.a weld with backing

Explanation: The flag symbol at the elbow of the reference line in AWS A2.4 indicates a field weld — one to be made at the jobsite rather than in the shop. The circle symbol, not the flag, indicates an all-around weld.

7A job requires depositing 35 pounds of weld metal. The electrode deposition efficiency is 90%. How many pounds of electrode must be ordered?

A.39 pounds

B.35 pounds

C.31.5 pounds

D.42 pounds

Explanation: Deposition efficiency means only 90% of the electrode weight becomes deposited weld metal. Required electrode = 35 ÷ 0.90 ≈ 39 pounds, the rest being stub loss and spatter.

8Stainless steel can be distinguished from mild steel because stainless steel is:

A.non-magnetic or only weakly magnetic and resists corrosion

B.heavily magnetic and rusts readily

C.produces long dense forked sparks when ground

D.much lighter in weight than mild steel

Explanation: Austenitic stainless steels are non-magnetic or weakly magnetic and, by design, resist corrosion, which distinguishes them from mild steel. Mild steel is strongly magnetic and rusts when exposed to moisture.

9When selecting filler metal for welding carbon steel, the filler metal should:

A.match or slightly exceed the tensile strength of the base metal

B.always be one grade stronger than the base metal regardless of application

C.be lower in tensile strength than the base metal for ductility

D.match the chemical composition of the base metal exactly

Explanation: Filler metal for carbon steel is generally chosen to match or slightly exceed the base metal tensile strength, ensuring the weld is at least as strong as the parent metal. Exact chemistry matching is less important than matching strength for most structural applications.

10A drawing shows a fillet weld symbol with 5/16 to its left, and the symbol sits below the reference line. This indicates a 5/16 inch fillet weld:

A.on the arrow side of the joint

B.on the other side of the joint

C.on both sides of the joint

D.as an all-around weld

Explanation: Per AWS A2.4, the dimension to the left of a fillet weld symbol states the leg size, and a symbol placed BELOW the reference line calls for the weld on the arrow side of the joint. A single number means both legs are equal, so this is a 5/16 by 5/16 inch fillet on the face the arrow touches.

About the CSLB C-60 Exam

The C-60 Welding exam assesses the knowledge and skills necessary to plan, prepare, perform, and cut welding, brazing, and soldering work, including metal identification and safety.

Assessment

Question count not published by the exam provider

Time Limit

3.5 hours

Passing Score

Disclosed at test site

Exam Fee

$450 application fee (California Contractors State License Board (CSLB))

CSLB C-60 Exam Content Outline

17%

Planning and Estimating

Reviewing plans and specifications, estimating equipment and materials, and identifying metals.

22%

Welding Preparation

Preparing job sites, setting up welding equipment, and preparing materials.

28%

Welding, Brazing, and Soldering

Welding processes, welding techniques, post-welding procedures, and brazing and soldering.

11%

Cutting Processes

Setting up cutting equipment, cutting techniques, and finishing requirements.

22%

Safety

Job site and equipment safety, preventing fire hazards, and personnel safety per AWS Z49.1 and Cal/OSHA Title 8.

How to Pass the CSLB C-60 Exam

What You Need to Know

Passing score: Disclosed at test site
Assessment: Question count not published by the exam provider
Time limit: 3.5 hours
Exam fee: $450 application fee

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

CSLB C-60 Study Tips from Top Performers

1Review AWS D1.1 Structural Welding Code, including the minimum steel thickness it covers, and AWS A2.4 welding symbols.

2Practice cost calculations using price-per-weight (e.g., dollars per 100 pounds of steel) and project tonnage.

3Know the common processes (SMAW, GMAW, FCAW, GTAW) and how to control defects such as excess spatter by adjusting stickout and angle.

4Study brazing and soldering joint design, flux selection, and temperature requirements.

5Familiarize yourself with AWS Z49.1 and Cal/OSHA Title 8 fire-prevention and personnel-safety provisions.

Frequently Asked Questions

Are these practice questions the real CSLB C-60 exam questions?

No. These are independently written study questions built from the topic areas and weights in CSLB's official C-60 examination study guide. They are a study aid for the knowledge the exam covers and do not reproduce CSLB's item bank, replace the required journey-level experience, or substitute for the official examination.

What is the format of the C-60 exam?

The exam is a closed-book, multiple-choice test administered by PSI, taking up to 3.5 hours. A calculator is provided and some questions require computation.

How much experience is required?

You need at least four years of journey-level experience within the last ten years.

Are code books allowed in the exam?

No, it is a closed-book examination. No outside reference materials or code books are permitted.

Is the exam offered in Spanish?

CSLB publishes a Spanish-language study guide for this classification, but the examination itself is administered in English only. Spanish exam versions are available for only 10 commonly taken classifications; for other exams CSLB may approve a translator to read the exam to you.

100+ Free CSLB C-60 Practice Questions

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