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Red Seal Program (with provincial and territorial apprenticeship authorities)

Red Seal Welder Interprovincial Exam

The Red Seal Welder exam is the interprovincial certification exam for the trade Ontario calls Welder (456A). It has 125 multiple-choice questions drawn from four major work activities, with welding processes making up the largest share, and the Red Seal pass mark is 70%. You apply for and write it through your provincial or territorial apprenticeship authority.

Last checked against Red Seal Program (with provincial and territorial apprenticeship authorities) on .

Red Seal Welder (456A) at a glance

Number of questions
125 multiple-choice questions source ↗
Pass mark
70% source ↗
Maximum time allowed
4 hours source ↗
Question format
Multiple choice, four options with one correct answer source ↗
Largest exam area
MWA D, welding processes: 54 of 125 questions source ↗
Provided during the exam
Formulas and acronyms source ↗
National Occupational Classification
NOC 72106 source ↗
Ontario 456A apprenticeship hours
About 6,000 hours (5,280 on the job and 720 in school) source ↗
Start the free 30-question practice test

What the Red Seal Welder (456A) covers

AreaWeightWhat to know
A – Performs common occupational skills20 questionsMaintaining tools and equipment, access and material handling equipment, safety-related activities, organizing work, and routine trade activities such as preheating and interpreting drawings.
B – Performs layout and fabrication of components for welding28 questionsLayout (12 questions) and fabricating components (16 questions): measuring, marking, joint preparation, fit-up, tacking and distortion control.
C – Performs cutting and gouging23 questionsNon-thermal cutting and grinding, oxy-fuel gas cutting (OFC), plasma arc cutting (PAC) and air carbon arc cutting and gouging (CAC-A).
D – Welding processes54 questionsShielded metal arc welding (18), flux-cored, metal-cored and gas metal arc welding (18), gas tungsten arc welding (13) and submerged arc welding (5).

How to get certified

  1. 1

    Register as an apprentice with your provincial or territorial authority

    Apprenticeship is run by each province and territory (for example Skilled Trades Ontario, SkilledTradesBC or Alberta Apprenticeship and Industry Training). Hours, in-school levels and fees differ, so confirm the requirements where you work. In Ontario, Welder (456A) is a non-compulsory trade.

  2. 2

    Complete your on-the-job hours and technical training

    Log your work-based hours and complete each level of in-school training. Skilled Trades Ontario lists about 6,000 hours for 456A: 5,280 hours on the job and 720 hours in school.

  3. 3

    Or apply as a trade qualifier / challenger

    Experienced welders who never registered as apprentices can usually apply to challenge the exam by documenting their trade experience (in Ontario, through a Trade Equivalency Assessment). Each authority sets its own hour thresholds and evidence rules.

  4. 4

    Complete the practical assessment where required

    Some jurisdictions require a hands-on welding and cutting assessment as well as the written exam. In Ontario, the Welder practical assessment must be completed before the written Certificate of Qualification exam; apprentices normally do it during in-school training.

  5. 5

    Get approved and book the written exam

    Once your authority confirms you are eligible, it tells you how and where to write. Use the official exam breakdown on red-seal.ca to plan your study by major work activity and task.

  6. 6

    Write the exam and receive your certificate

    Expect 125 multiple-choice questions and up to 4 hours; you need 70% to pass. Passing, along with your jurisdiction's other requirements, leads to a certificate of qualification with the Red Seal endorsement, recognized across participating provinces and territories.

How to study

  • Study by the official weightings: welding processes alone are 54 of 125 questions, and SMAW plus FCAW/MCAW/GMAW account for 36 of those.
  • Learn CSA W48 electrode and wire classifications (for example E4918, E4310 and ER49S-6) until you can decode strength, position and coating at a glance.
  • For each process, know the polarity, shielding, transfer mode or electrode type, and the common defects with their causes and fixes.
  • Practise layout maths with a basic calculator: circumferences, diagonals, bevel and groove angles, and plate mass in metric units. Formulas are provided at the exam, but you still need to apply them quickly.
  • Take timed practice sets: 125 questions in 4 hours is just under 2 minutes per question, so mark long calculations and come back to them.

Frequently asked questions

How many questions are on the Red Seal Welder exam?

The Red Seal Program lists 125 multiple-choice questions for the Welder trade. They are split across four major work activities: 20 common occupational skills, 28 layout and fabrication, 23 cutting and gouging, and 54 welding processes.

What score do I need to pass, and how long do I get?

The Red Seal pass mark is 70%, which on a 125-question exam means about 88 correct answers. Red Seal states a maximum of 4 hours for its exams. Ask your apprenticeship authority about accommodations, because those are arranged locally.

Are formulas provided during the exam?

Yes. Red Seal's Welder exam information says formulas and acronyms are provided during the exam sitting. You still need to know when and how to apply them, so practise layout and conversion problems beforehand.

Is 456A the same as the Red Seal Welder trade?

456A is Ontario's code for the Welder trade, which is part of the Red Seal program. In Ontario, Skilled Trades Ontario issues the Certificate of Qualification, and a practical welding assessment must be completed before the written exam. Other provinces use the Red Seal trade name or their own titles, such as Welder Level A or B in British Columbia.

How is Red Seal Welder different from a CWB ticket or the AWS CWI?

They measure different things. The Red Seal Welder certificate shows you have completed the trade's apprenticeship or equivalent and passed the interprovincial theory exam. A CWB welder qualification, often called a ticket, is a practical test showing you can weld a specific process and position to CSA W47.1 (or W47.2 for aluminum), and it must be kept current under CWB rules. A welder can hold one without the other. The AWS Certified Welding Inspector (CWI) is an American inspection credential for people who inspect welds, not a welding trade certificate; VoltExam offers separate CWI preparation on its US site.

Which welding standards should I know?

Canadian welding work commonly refers to CSA W59 (welded steel construction), CSA W47.1 (certification of companies for fusion welding of steel), CSA W48 (filler metals and allied materials) and CSA W117.2 (safety in welding, cutting and allied processes). The Red Seal exam tests trade knowledge rather than clause numbers, but knowing what each standard covers helps.

Is the exam changing soon?

Red Seal published a new Red Seal Occupational Standard for Welder in 2023, and its trade page says exams based on that standard are under development. Check the Welder page on red-seal.ca for which standard current exams are based on, and confirm with your authority before you write.

Are these practice questions from the real exam?

No. VoltExam's questions are original items written to practise the topics in the official exam breakdown. They are not official Red Seal questions, and doing well on them does not guarantee a pass.

Free calculators for this exam

Official sources

Sources checked November 2, 2026. VoltExam is independent and not affiliated with Red Seal Program (with provincial and territorial apprenticeship authorities). Rules change: confirm details with the official source before your exam.