26 Most Used - Welding Inspection Tools & Instruments.

Measurement and inspection of welded joint is an important step in quality control and reliability of welded constructions. External inspection allows you to detect such external defects such as undercuts, uncertified craters facing surface cracks, lack of fusion, flows, etc. Meters of welded joints and welding templates (templates welder) allow us to determine the size of joints, joint width and high, angle of bevel, depth and width of preparation, included angle, root gap, dept. of root face, convexity, smoothness of transition weld to the base metal, leg length, etc.

Here are the few 26 Most Used - Welding Inspection Tools & Instruments :-


A tool used to accurately check butt and fillet welds in order to meet exact weld specifications. It measures the size of concave fillet welds, maximum convexity, as well as butt weld reinforcements.


The Vernier height gauge has a vernier caliper, equipped with a special base block, measuring jaw, and other attachments which make the instrument suitable for height measurements.

Surface roughness comparators are used within industry to measure or verify the as-manufactured surface finish (roughness) of a part or assembly. Comparators are selected and used based on the manufacturing process used to create a particular surface finish.


A radius gauge, also known as a fillet gauge, is a tool used to measure the radius of an object.
Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction.


Depth micrometer used to measure the depth of an object with precision and accuracy with least count of 0.01 mm. The measuring span is 25 mm just like in micrometer, that can change by changing upsetting rod.


It is an essential tool for pipe and welding inspection. It can perform the following functions :
  • Used to measure internal misalignment.
  • Used to measure pipe wall thickness.
  • Used to measure fit-up Gap.
  • Used to measure crown height of butt welds
  • Quickly determines if fillet welds meet NRC Visual Weld Acceptance Criteria for Structural Weldments.


The Bridge Cam Gauge, commonly known as the Cambridge gauge, is an accurate, sturdy gauge for both shop and field applications. It can measure fillet weld leg length and throat thickness, height of weld reinforcement, depth of undercut, misalignment and the angle of preparation.


Digital Vernier Caliper is upgrading version of Analog Vernier Caliper, which is a widely used linear measurement instrument with a least count of 0.01 mm, more accurate than Analog.

This Digital type of Vernier is similar to Analog Vernier Caliper Instead Dimension output in Digital Manner that is more convinces than analog type.


A magnifying glass (or loupe, from Old French, meaning an imperfect gem), is the simplest of optical instruments intended for the enhancement of visual capability.
A loupe  is a simple, small magnification device used to see small details more closely. They generally have higher magnification than a magnifying glass, and are designed to be held or worn close to the eye. A loupe does not have an attached handle, and its focusing lenses are contained in an opaque cylinder or cone. On some loupes this cylinder folds into an enclosing housing that protects the lenses when not in use.


A tape measure or measuring tape is a flexible ruler used to measure size or distance.
It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear-measurement markings. It is a common measuring tool. Its design allows for a measure of great length to be easily carried in pocket or toolkit and permits one to measure around curves or corners.


Spirit Level is a device which is used to check the level of surfaces especially surface tables. A spirit level is a basic bubble instrument such like It is an angular measuring device in which the bubble always moves to the highest point of a glass vial mounted top surface on Spirit Level.


A borescope occasionally called a boroscope, though this spelling is nonstandard is an optical instrument designed to assist visual inspection of narrow, difficult-to-reach cavities, consisting of a rigid or flexible tube with an eyepiece or display on one end, an objective lens or camera on the other, linked together by an optical or electrical system in between.

A go/no-go gauge refers to an inspection tool used to check a workpiece against its allowed tolerances via a go/no-go test. Its name is derived from two tests: the check involves the work piece having to pass one test (go) and fail the other (no-go).


A feeler gauge is a tool used to measure gap widths. Feeler gauges are mostly used in engineering to measure the clearance between two parts.


A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrologica0 instruments such as dial, vernier, and digital calipers.


Inside Micrometer is used to measure the larger internal dimension. Inside Micrometer can measure internal Diameter of holes and registers.


This small pocket sized stainless steel gauge is designed to identify the condition of pipe like Depth of Pit, Pipe thickness etc. Gauge includes 110mm long scale in Metric & Inch. Conversion Table available on back side & formulas on top.
Range:- 0 to 13mm


Steel rules, also called rulers, are essential in any shop when accuracy matters. Steel rules are inherently more accurate than folding rules because they are made in one piece and so avoid the inaccuracies, however small, which are inherent in folding rules because of the to play in their hinges. The requirements for accuracy in steel rules vary greatly, however, and the range of products varies likewise.


A taper gauge is a measuring tool that measures sizes such as the width of gaps and grooves, hole diameter, and pipe inner diameter. In addition to models made of metals such as carbon tool steel and stainless steel, there are also models made of plastic that do not easily damage the object. Metal models with round cut gauge tips are even safer. They can make accurate measurements with a scale of 0.05 mm from 1 to 60 mm. A taper gauges has a case or cap made of brass or polycarbonate for easy carrying, so there are many types that can easily fit in the breast pocket.


A measuring instrument consisting of an L-shaped frame with a linear scale along its longer arm and an L-shaped sliding attachment with a vernier, used to read directly the dimension of an object represented by the separation between the inner or outer edges of the two shorter arms.


There are two methods for performing dimensional measurements: direct measurement and indirect measurement. With direct measurements, measuring instruments such as Vernier calipers, micrometers, and coordinate measuring machines are used to measure the dimensions of the target directly. These measurements are also known as absolute measurements. Measurements can be performed over a wide range specified by the scale of the measuring instrument, but there is also the chance that the measurement will be wrong due to erroneous readings of the scale.
With indirect measurements, the dimensions are measured using measuring instruments such as dial gauges that look at the difference between targets and reference devices such as gauge blocks and ring gauges. These are also known as comparative measurements due to the fact that a comparison is performed using an object with standard dimensions.


The V-WAC Single Weld Gauge can be used to measure undercut at the toe of the weld for both butt welds and fillet welds. It has a number of other purposes which make it versatile.

It can be used to measure weld cap height and can estimate the size of porosity with the inbuilt porosity comparator. As porosity is often assessed as the number of pores per a given length the V-WAC has a 25mm calibrated section so this assessment can be made.

The V-WAC Single Weld Gauge can measure undercuts / Pits to 6mm, Crowns to 6mm by 0.5mm Increments, check porosity, and crown height.


A Versatile tool for the use of welding operator. The tool can be used with ease for weld joint preparatory functions as well as for checking of the weld joint. The tool combines a bore gauge, angle gauge, depth gauge & weld height gauge. The tool is made in stainless steel with polish finish.


  • "Measure concave or convex fillet welds ranging in 1/8"" to 1"" in size"
  • Stainless steel construction to improve durability and prevent rust
  • Durable laser etched size marking with black ink fill for improved visibility
  • Precision cut smooth edges to prevent cuts during use


Rounded Indications is a Indications with a maximum length of three times the width or less on the radiograph are defined as rounded indications. These indications may be circular, elliptical, conical, or irregular in shape and may have tails. When evaluating the size of an indication, the tail shall be included. The indication may be from any imperfection in the weld, such as porosity, slag, or tungsten.


A borescope (occasionally called a boroscope, though this spelling is nonstandard) is an optical instrument designed to assist visual inspection of narrow, difficult-to-reach cavities, consisting of a rigid or flexible tube with an eyepiece or display on one end, an objective lens or camera on the other, linked together by an optical or electrical system in between. The optical system in some instances is accompanied by (typically fiberoptic) illumination to enhance brightness and contrast. An internal image of the illuminated object is formed by the objective lens and magnified by the eyepiece which presents it to the viewer's eye.


A borescope (occasionally called a boroscope, though this spelling is nonstandard) is an optical instrument designed to assist visual inspection of narrow, difficult-to-reach cavities, consisting of a rigid or flexible tube with an eyepiece or display on one end, an objective lens or camera on the other, linked together by an optical or electrical system in between. 

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