456A Exam Questions and Answers PDF — Free 50-Question Mock Exam

What's inside

• 50 original exam-style questions covering the 456A Welder topic areas used on this site — GMAW, SMAW, GTAW, Safety & Tools, OFC (oxy-fuel cutting), FCAW and Theory
• Every answer explained in the back of the PDF, so a wrong answer turns into something learned, not just a lost mark
• Works offline — study in the lunchroom, the truck, or anywhere without a signal. No account needed.

Want every question?

This mock exam is a 50-question slice. The 456A Complete Question Bank has all 125 questions with a full explanation for every answer, grouped by this site's own topic areas (not one-to-one with the official Major Work Activities), in one printable offline PDF.

Corrections to the question banks are listed with dates on the question bank updates page.

What the 456A question bank covers, topic by topic

The free PDF is a 50-question slice of a 125-question pool grouped by this site's own Welder topic areas (not one-to-one with the official Major Work Activities shown on the 456A page). On the official exam, layout and fabrication (28 questions) and cutting and gouging (23) carry more weight than they do in this pool. Here is how those 125 are distributed, what each area asks about, and what to check.

• GMAW — 25 questions The largest block. Transfer modes, shielding gas choice, wire classification, contact tip to work distance, and the machine side — inductance, constant-voltage output, wire feed speed versus voltage. Knowing spray transfer exists is not enough: be able to say which combination of current, wire diameter and gas reaches it. Cold lap, birdnesting and burn-back each have one most-likely cause, and the question wants that one.
• SMAW — 24 questions Electrode classification is the backbone: reading E7018 digit by digit, why E6010 digs and E6013 suits thin sheet, why low-hydrogen rods live in an oven. Then heat control — preheat, interpass temperature, carbon equivalent — and named defects: undercut, slag inclusion, crater cracking, arc blow. Hood time on 7018 does not rescue you here, because the exam asks why rather than how.
• GTAW — 20 questions Tungsten selection, tip grind and grind direction, polarity logic (DCEN for steel, AC for aluminum), post-flow, gas lenses and back-purging on pipe. The defects are visual: tungsten contamination, sugaring on a stainless root, soot around the puddle. Know the AC balance control — not only what cleaning action is, but which way to move the balance to get more of it.
• Safety & Tools — 17 questions Confined-space entry order, lens shade by process and amperage, oxygen and fuel gas cylinder separation, ventilation minimums, and the hazards that give no warning — argon and CO₂ are heavier than air and pool in pits until they displace oxygen. These look like easy marks, but many are sequence questions, where a true answer in the wrong position still scores zero.
• OFC (oxy-fuel cutting) — 13 questions The mechanism first: OFC preheats steel to kindling temperature, then oxidizes it with a high-pressure oxygen jet. It burns the steel; it does not melt it. Around that sit flame settings, tip selection, pressures, travel speed and drag lines. The preheat flame does not do the cutting, and getting that wrong carries through every question about pressure and speed.
• FCAW — 12 questions The self-shielded versus gas-shielded split drives most of this area: why FCAW-S runs outdoors in wind and FCAW-G does not, the polarity each takes, and why electrical stickout is longer than with solid wire. Decoding E71T-1 does the job E7018 does in SMAW.
• Theory — 14 questions The weld-quality and paperwork content that belongs to no single process: WPS versus PQR, what a root bend test reveals about ductility and soundness, which positions a 3G plate qualification carries, stringer versus weave. It is not hood time, so it is easy to leave out of self-study; give it its own sessions.

Getting real information out of the 50 questions

A mock exam is a diagnostic, not a study session. Looking up an answer the moment you feel unsure hides the exact gap you were hunting for.

Sit all 50 in one block with a clock running, no notes and no welding handbook. Answer everything. As you go, put a dot in the margin beside any question you guessed — including the ones you guessed correctly. Count that second group as misses too: a lucky guess does not hold up under exam pressure.

Then study only the misses, sorted by topic rather than in question order. Four wrong in GMAW and three in FCAW is not seven problems; it is one gap in wire-fed process variables, and closing it clears all seven. If the misses cluster in Theory and Safety & Tools instead, the issue is usually reading rather than welding knowledge — noticing that the question asked for a sequence, or for the most likely cause.

Read the explanations only after you have committed to an answer on paper, then retake the same 50 cold a few days later.

Where Welder certification fits, and how these questions map to it

Welder is a Red Seal designated trade in all thirteen provinces and territories. In Ontario it is administered under trade code 456A, which is where this PDF's name comes from; elsewhere the same trade carries a different code or none at all. The standard behind it is national, so a question on transfer modes or electrode classification is equally valid wherever you are apprenticing.

What differs by jurisdiction is administration — required hours, in-school blocks, when you become eligible to write. The exam figures are published by the Red Seal Program: 125 questions for this trade (red-seal.ca exam information), and its Exam Preparation Guide states a 70% pass mark and a four-hour writing time. Your provincial or territorial apprenticeship authority administers the exam and rules on eligibility and scheduling.

The questions map to the topic structure above, in the multiple-choice, single-best-answer format used for trade knowledge testing. This is independent study material: it carries no credit, satisfies no apprenticeship requirement, and working through it does not lead to a Red Seal endorsement — that comes from your jurisdiction once you meet its requirements.

Questions welders ask about this PDF

• Are these the real exam questions? No. Every question is original, written in the style and format used for trade knowledge exams. Live exam banks are secure and nobody publishes them — a resource claiming to hand you the actual questions is either mistaken or lying.
• I am not in Ontario. Is a "456A" PDF still useful? Yes. 456A is only Ontario's trade code for Welder, and Welder is Red Seal designated in every province and territory against one national standard. Nothing in the GMAW, SMAW, GTAW, FCAW, OFC or theory content is Ontario-specific.
• Does this cover the hands-on test? No — written knowledge only. Weld tests and position qualification are assessed separately, and no amount of multiple choice replaces time under the hood. Some theory does overlap usefully: position qualification ranges, WPS interpretation, defect identification.
• Free 50 first, or go straight to the full bank? Free 50 first, as a diagnostic. It is drawn from the same pool as the 125-question bank, so sitting it timed shows which of the seven topic areas your misses cluster in. The full bank is the same material at greater depth, grouped by topic.