AWS Certified Welder common mistakes
AWS Certified Welder · Understand the traps and how to avoid them.
Assuming a single 'best' process (usually SMAW) applies to every item instead of matching the process named or implied by the electrode/filler designation, shielding gas, or equipment described in the stem.
Candidates train on one process and pattern-match every scenario to it, missing cues such as a solid wire with a gas flow rate (GMAW), a flux-cored wire (FCAW), a tungsten electrode (GTAW), or a self-shielded electrode.
What to do instead
Before answering, extract the process identifiers from the stem: filler classification prefix (E70S-, E71T-, ER70S-, E6010), presence or absence of shielding gas, electrode type (consumable vs. tungsten), and transfer mode. Build a one-page decision table linking each cue to its process and drill it until recognition is automatic.
Treating SMAW electrode classification digits as interchangeable, e.g., expecting an E6010 to run like an E7018 or assuming the third and fourth digits describe the same property.
The four-digit system encodes tensile strength, position, coating/current type, and hydrogen/iron-powder content, and candidates memorize only the tensile number while ignoring the position and usability digits.
What to do instead
Learn the classification field by field: first two digits tensile strength in ksi, third digit position and current (1 = all position, DC+; 2 = flat and horizontal, AC or DC; 3 = flat, high deposition), fourth digit coating and hydrogen level (0 = cellulose sodium, high hydrogen; 8 = low hydrogen, iron powder). Practice reading a designation aloud and stating each field.
Selecting a polarity or current type from habit rather than from the electrode or process requirement stated in the question.
Candidates conflate 'electrode positive' with 'reverse polarity' inconsistently, and some processes (GTAW on aluminum with AC, self-shielded FCAW on DCEN) have counterintuitive requirements.
What to do instead
Memorize a short polarity matrix: SMAW cellulosic and low-hydrogen electrodes on DCEP (reverse); GTAW steel on DCEN, aluminum on AC; GMAW short-circuit on DCEP; self-shielded FCAW on DCEN. For each practice item, write the polarity beside the process name before choosing an answer.
Answering position questions using a mental picture of the whole part rather than the specific weld axis and progression direction named in the stem.
Candidates see a vertical member or a pipe and default to 'vertical' or 'pipe position', forgetting that position is defined by the weld's axis and the welder's progression, not by the member's orientation.
What to do instead
Apply the fixed definitions: flat welds on the top side with the axis horizontal; horizontal welds on a vertical face with the axis horizontal; vertical welds with the axis vertical; overhead welds from below. For pipe, use the 1G/2G/5G/6G scheme and identify axis and rotation (rotated vs. fixed) first, then map to the plate position.
Confusing 5G with 6G on pipe items, or assuming a fixed pipe tested in the 5G position also qualifies the 6G position.
Both involve a fixed pipe with a vertical axis, and the distinction (6G includes progression through all four quadrants, including overhead, at roughly 45 degrees) is easy to blur under time pressure.
What to do instead
Anchor the difference: 5G is a fixed horizontal pipe with the axis horizontal and welds made in flat, vertical, and overhead quadrants; 6G is a fixed pipe inclined about 45 degrees with the axis at 45 degrees, requiring welding in all positions around the circumference. Sketch both before answering.
Choosing travel direction or technique for vertical welds without checking whether the process and electrode call for uphill or downhill progression.
Candidates learn 'vertical' as one skill, but cellulosic electrodes and some FCAW wires are commonly run downhill for speed, while low-hydrogen and most structural work is run uphill for penetration.
What to do instead
Link progression to the consumable and code intent: E6010/E6011 vertical-down for root and pipe work, E7018 vertical-up, FCAW often vertical-up for structural. When a stem specifies progression, read it as a hard constraint; when it does not, infer from the electrode classification and application.
Ignoring base-metal condition cues such as carbon equivalent, thickness, preheat, or cleanliness and answering as if all steel welds identically.
Candidates focus on the process and position and skim the material description, missing that high-carbon-equivalent or thick sections drive preheat and low-hydrogen practice, and that mill scale or moisture drives porosity.
What to do instead
Scan every stem for a material line and translate it: carbon equivalent above roughly 0.40 suggests preheat and low-hydrogen consumables; thick sections suggest preheat and interpass control; dirty or damp surfaces suggest porosity risk and cleaning or drying steps. Make a checklist of these triggers and apply it before reading the answer options.
Applying steel procedures to stainless steel or aluminum without adjusting for their distinct behavior, such as expecting aluminum to show a color change before melting.
Candidates generalize from carbon steel, where preheat color and slag behavior are familiar, and do not account for aluminum's high conductivity, oxide layer, and lack of color change, or stainless steel's distortion and sensitization concerns.
What to do instead
Memorize a short contrast table per material family: aluminum needs AC or DCEP GTAW, oxide removal, higher heat input and a puddle that looks unchanged until it moves; stainless needs lower heat input, back purging where specified, and low-carbon or stabilized grades for sensitization. Practice material-identification items separately from process items.
Treating joint type and weld type as the same thing, e.g., calling a single-V groove a butt weld in every context or mislabeling a T-joint as a corner joint.
The terms overlap in casual usage, and candidates do not separate the five joint types (butt, lap, T, corner, edge) from the groove/fillet weld types made in them.
What to do instead
Draw the five joint configurations and label the weld types that can be made in each. State both in every answer: 'a single-V groove weld in a butt joint' versus 'a fillet weld in a T-joint'. Use the stem's wording to confirm which the question is asking about.
Assuming a qualification test on one pipe diameter, thickness, or position automatically covers all others, rather than recalling the usual range-of-qualification rules.
Candidates remember that a passed test 'qualifies you' without learning the essential-variable logic that narrows or extends coverage by diameter, thickness, position, and progression.
What to do instead
Learn the essential variables as a set: diameter (small-diameter tests usually qualify only small diameters, while larger tests qualify downward), thickness (test thickness sets the qualified range), position (a higher position generally qualifies lower ones), and progression (uphill qualifies both, downhill only downhill). Practice range-of-qualification items with a written variable grid.