← Welder overview

04 · HOW · ASSEMBLE PATH

How do I enter the Welder trade?

Ontario’s registered apprenticeship combines paid workplace learning with three levels of in-school training and a certifying exam.

Adult welding apprentice and instructor safely assessing a finished weld in a training lab
6,000 hoursgeneral program total
5,280 hoursworkplace training
720 hoursin-school training
≈ 3 yearsgeneral time frame

These are Skilled Trades Ontario’s general figures. Completion varies by progress, training delivery, employer and opportunity to practise the required competencies.

THE PATHWAY

From first bead to Red Seal

01

Explore

Try manufacturing, metalwork, design, shop projects or a supervised welding experience.

02

Prepare

Complete Grade 12 and build mathematics, drawing, communication and safe-work foundations. Ask about co-op, OYAP, SHSM and dual credits.

03

Find a sponsor

An Ontario sponsor may be an employer, union or group responsible for apprenticeship training.

04

Register

Register a Training Agreement through Ontario’s apprenticeship system.

05

Train

Complete signed-off workplace competencies and 720 hours of in-school training across three levels.

06

Certify

Complete the apprenticeship and pass the certifying exam for an Ontario Certificate of Qualification and Red Seal endorsement.

07

Advance

Add process, position, code, inspection, supervisory or business qualifications as your goals require.

START WHILE IN SCHOOL

Turn interest into supervised practice

Ask your guidance counsellor about:

  • Manufacturing or technological education
  • Co-operative education placements
  • Ontario Youth Apprenticeship Program
  • Specialist High Skills Major
  • Dual-credit and college partnerships

ONTARIO ENTRY PICTURE

Prepare for the apprenticeship route

16+

Ontario apprenticeship applicants must be at least 16.

Work status

Have legal permission to work in Canada.

Grade 12

The STO trade report lists Grade 12 as the academic entry grade.

Sponsor

Secure an Ontario apprenticeship sponsor.

CERTIFICATION

Apprenticeship → exam → Certificate of Qualification + Red Seal

Welder is a non-compulsory Ontario trade. Certification is valuable but not generally required merely to practise the trade. However, Skilled Trades Ontario warns that certain welding tasks legally require separate certification from the Technical Standards and Safety Authority.

ADVANCED SPECIALIZATION

How underwater welding becomes possible

Underwater welders are occupational divers first: welding certification alone does not qualify someone to work underwater. In Canada, commercial-diver competency is based on the CSA Z275.4 framework, and the Diver Certification Board of Canada certifies divers and accredits training establishments.

  1. Build strong topside welding and fabrication skills.
  2. Meet commercial-diving prerequisites, including swimming ability and a medical examination by a qualified diving and hyperbaric physician.
  3. Complete an accredited occupational-diver program appropriate to the intended work, often involving surface-supplied diving.
  4. Train and qualify in underwater cutting, wet or dry welding, dive planning and emergency procedures.
  5. Work as part of a supervised dive team under the rules that apply to the jurisdiction and project.

This career carries serious hazards, including pressure and decompression exposure, entanglement, low visibility, contaminated water, electricity and changing water conditions. It must never be presented as ordinary recreational scuba diving.

See DCBC-accredited Canadian training establishments ↗

EVIDENCE BASE

Sources & verification

Regulated, numerical and time-sensitive claims link to the authority used. Accessed and reviewed August 24, 2026.

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