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Weld inspection checklist (visual welding inspection)

A weld inspection checklist is the inspector's list of what to check on a welded joint, and visual welding inspection is the first and most used way to check it: looking at the joint with a good light, a weld gauge and a few hand tools, before, during and after welding. Most rejects are made before the arc is struck, by poor fit-up, a dirty joint, the wrong filler or skipped preheat, so this checklist starts there. It has 30 checks in four groups: 10 before welding, 7 during welding, 11 visual checks on the finished weld and 2 for the records. It also has a guide to the discontinuities visual inspection looks for, a weld map report that gives every weld an ID, and a worked example. The accept and reject limits come from your code, never from this sheet. AWS D1.1, the structural steel welding code, sets visual acceptance criteria in a table in its inspection clause (Table 8.1 in recent editions, Table 6.1 in older ones); ASME and other codes set their own. The Excel version keeps the weld map, counts accepts and rejects by welder, and tracks each repair to its re-inspection. It is a checklist for your welders, supervisors and inspectors, not a stand-in for a qualified welding inspector where your code or customer asks for one.

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Page 1 of the weld inspection checklistHeader fields for the job, drawing, WPS, code and inspector, and the checks before and during welding with OK, Not OK and N/A columns.
30 checks before, during and afterDiscontinuity guideWeld map reportWeld ID for every jointAccept or reject per weldRepair and re-inspectionRejects by welderWorked example
Filled-in Weld inspection checklist (visual welding inspection): a 12-weld support frame with two rejects
The same sheet filled in with the worked example (page 5 of the PDF, illustrative numbers). Open full size (opens the picture in a new tab)

When to use it

When to use a weld inspection checklist

  • On every code weld: the welder or supervisor runs the before and during checks, and the inspector the checks after welding.
  • When a new WPS, welder or fixture starts, on the first assemblies off.
  • When weld repairs rise, to see whether the cause sits before, during or after the welding.
  • For customer or third-party inspection, as the record of what was checked on each weld.

How to fill it in

  1. 1

    Map the welds

    Give every weld on the drawing an ID on a weld map (page 3 of the PDF), with its joint type, size, WPS and the welder who makes it.

  2. 2

    Check before welding

    The WPS is at the station, the welder is qualified and current, the material and filler are right, and the joint is prepared, fitted and clean, with preheat where called for.

  3. 3

    Spot check during welding

    Settings and interpass temperature against the WPS, the root pass, cleaning between passes and the weld sequence.

  4. 4

    Inspect the finished weld

    Once it has cooled as your code requires and is clean: size and length with a weld gauge, profile, cracks, fusion, craters, undercut, porosity, arc strikes and distortion, each judged against your code's table.

  5. 5

    Record accept or reject for each weld

    Write the result against the weld ID, and for every reject the discontinuity, where it is and its size.

  6. 6

    Repair and inspect again

    Tag the reject, repair it to an approved repair procedure, inspect it again and record both results. Send it for NDT where the drawing or code asks.

What visual inspection looks for

Common weld discontinuities, their causes and where the limits come from

Named the way most codes and inspectors name them. The limits are left out on purpose: they depend on the code, its edition, the loading (static or cyclic) and the joint, so read them from your code's table.

  • Crack

    What it looks like
    A line in the weld or the heat-affected zone, along or across the weld
    Usual causes
    Hydrogen, no preheat on thick or hardenable steel, high restraint, an unfilled crater
    Accept or reject
    AWS D1.1 accepts no crack of any size; check your own code.
  • Incomplete fusion

    What it looks like
    Weld metal lying on the base metal or the last pass without melting into it
    Usual causes
    Heat input too low, wrong torch angle, travel too fast, a dirty joint
    Accept or reject
    Check your code; usually rejected where it can be seen.
  • Undercut

    What it looks like
    A groove melted into the base metal at the toe of the weld
    Usual causes
    Current or travel speed too high, arc too long, wrong angle
    Accept or reject
    Limited by depth and length in your code's table.
  • Porosity

    What it looks like
    Round holes in the surface from trapped gas
    Usual causes
    Oil, rust, paint or moisture; gas flow too low or too high; drafts
    Accept or reject
    Limited by size and count in your code's table.
  • Overlap

    What it looks like
    Weld metal rolled over the base metal at the toe without fusing
    Usual causes
    Too much metal, travel too slow, heat too low
    Accept or reject
    Check your code; usually rejected.
  • Underfill or unfilled crater

    What it looks like
    The weld face or the weld end below the required size
    Usual causes
    Travel too fast, the arc broken off too quickly at the stop
    Accept or reject
    Check size and crater fill against your code.
  • Excess reinforcement or convexity

    What it looks like
    The weld face too high or too rounded
    Usual causes
    Too much filler, travel too slow
    Accept or reject
    Limited in your code's table.
  • Arc strike

    What it looks like
    A small spot of melted metal outside the weld
    Usual causes
    Striking the arc on the part, a poor ground connection
    Accept or reject
    Check your code; may need grinding and a further check.
  • Short size or length

    What it looks like
    Leg or throat smaller than the drawing, or the weld too short
    Usual causes
    Wrong technique, a missed instruction
    Accept or reject
    Measure with a weld gauge against the drawing and your code's tolerance.

What's on the checklist

The 30 checks before, during and after welding

Ten before the arc is struck, seven while welding and eleven visual checks on the finished weld, plus two for the records. The sheet gives each check OK, Not OK or N/A; the accept or reject limits come from the code your job is built to, never from this sheet.

Before welding

Most rejects start here

  1. 1The welding procedure specification (WPS) for the joint is at the station, current and approved
  2. 2The welder is qualified for the process, position and thickness, and the qualification is current on the continuity log
  3. 3Base metal type, grade and thickness match the drawing and the WPS, and are traceable to their certificate where required
  4. 4Filler metal and shielding gas match the WPS, and low-hydrogen electrodes and flux are stored and issued the way their maker and the code require
  5. 5Joint preparation (bevel angle, root face, root opening) matches the drawing and the WPS
  6. 6Fit-up and alignment are within the drawing and code tolerances, with backing in place where called for
  7. 7Joint faces and the area around them are free of oil, rust, paint, scale and moisture
  8. 8Preheat is applied where the WPS calls for it and checked with a temperature indicating crayon or a contact thermometer
  9. 9Tack welds are sound and of the right size, and were made by a qualified welder
  10. 10Machine settings are inside the WPS ranges, and the welding equipment is in good condition

During welding

Spot checks at the station

  1. 11Current, voltage, wire feed and travel speed stay inside the WPS ranges (spot check and record)
  2. 12Interpass temperature is measured and kept inside the WPS limits
  3. 13The root pass is checked before the next pass, and back gouging is done and checked where the WPS calls for it
  4. 14Each pass is cleaned of slag and spatter before the next one
  5. 15The weld sequence on the drawing or the WPS is followed to control distortion
  6. 16The arc is shielded from drafts, and gas flow is checked at the nozzle
  7. 17Any need to work outside the WPS stops the job and goes to the welding engineer; nobody adjusts on the job

After welding: visual inspection

Accept or reject to your code's table

  1. 18The weld has cooled as your code requires before final inspection, and is clean enough to see the surface
  2. 19Weld size (leg or throat) and length match the drawing, checked with a weld gauge
  3. 20Reinforcement, convexity and overlap are within your code's limits
  4. 21No cracks in the weld or the heat-affected zone
  5. 22Fusion between the weld and the base metal, and between passes, is complete as far as can be seen
  6. 23Craters are filled to the full cross-section of the weld
  7. 24Undercut depth and length are within your code's limits
  8. 25Surface porosity is within your code's limits
  9. 26No arc strikes outside the weld, or any found are recorded and dealt with as your code requires
  10. 27Spatter is removed where the drawing, the coating or the customer asks
  11. 28Distortion and the assembly's dimensions are checked against the drawing

Records

So every weld can be traced

  1. 29Each weld has an ID on the weld map, with the welder's stamp or ID recorded against it
  2. 30A rejected weld is tagged, repaired to an approved repair procedure and inspected again, and any NDT the drawing or code asks for is requested

A filled-in example

Illustrative, not a benchmark

An example: visual inspection of an equipment support frame with 12 welds, built to AWS D1.1 for static loading by two welders (illustrative, the same as page 5 of the PDF and the Excel example sheet).

The example frame: 12 welds, 10 accepted first time

  • Accepted first time: 10 welds
  • Rejected, then repaired: 2 welds
  1. Welder W-317 of 7 accepted first time
  2. Welder W-343 of 5 accepted first time

    W5 undercut, W9 crater crack

Of 12 welds, 10 were accepted first time and 2 rejected: W5 for undercut and W9 for a crater crack, both by welder W-34. Both passed after repair.

83.3% accepted first time. Both rejects came from one welder and from weld toes and stops, which points at technique, not material.
  • Before welding: all 12 joints fitted and clean, the procedures at the station, and both welders current on the continuity log.
  • W5, an 8 mm fillet by welder W-34: undercut at the toe deeper than the code's limit over 40 mm. Rejected, ground out, rewelded to repair procedure RP-02 and accepted on re-inspection.
  • W9, a 6 mm fillet by W-34: a crack in the unfilled crater at the weld stop. Rejected; the crack was removed and confirmed gone with dye penetrant, the crater was rewelded and filled, then accepted.
  • The other 10 welds were accepted first time. Welder W-31 made 7 welds with no rejects; W-34 made 5 with 2 rejects.

10 of 12 welds accepted first time, 83.3%. Both rejects came from one welder and from weld toes and stops, so the supervisor watched W-34's torch angle and stops on the next frame, and crater fill went into the welders' one-point lesson.

Common mistakes

  • Inspecting only the finished weld

    By then the cause is buried. Most rejects come from fit-up, cleanliness, filler and preheat, so check them before the arc is struck.

  • Limits from memory

    Undercut and porosity limits differ by code, edition and loading. Keep your code's table at the inspection point.

  • Inspecting too soon

    Some steels can crack hours after welding. Wait as long as your code says before the final visual inspection.

  • No weld IDs

    Without a weld map, a reject cannot be traced to the welder, the joint or the repair.

  • Repairing without inspecting again

    A repair is a new weld. Inspect it again and record both results.

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FAQ

Weld inspection checklist (visual welding inspection): common questions

  1. Checking a weld by eye, with a good light, a weld gauge and simple tools, against the drawing and the code. It covers the joint before welding, the process during it and the finished weld, and it is the first inspection on almost every weld.

  2. Before welding: the procedure, the welder's qualification, the material, the fit-up, cleanliness and preheat. During welding: settings, interpass temperature and cleaning between passes. After: size, profile and discontinuities such as cracks, incomplete fusion, undercut, porosity and overlap.

  3. They come from the code the job is built to. AWS D1.1 sets them in a table in its inspection clause, split by static and cyclic loading and by tubular connections. ASME and other codes have their own. This checklist leaves the numbers to your code.

  4. When your code, your customer or your contract asks for one. Many shops have welders and supervisors run the before and during checks, and a qualified inspector sign off the final visual inspection.

  5. Not always, because it only finds what shows on the surface. The drawing, the code or the customer may call for NDT on some welds, such as dye penetrant, magnetic particle, ultrasonic or radiographic testing.

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