Welding Gauge – Different Types & How to Use

Welding is a job of precision, and you cannot even afford a tiny mistake. Because if you do, the whole structure will be weakened.

But how to achieve such precision? The answer is a welding gauge. It basically lets welders measure and analyze welds to guarantee they are meeting all the standard requirements of the industry.

So, if you’re just starting as a welder, a welding gauge manufacturer, or a professional welder, understand what a welding gauge is and how it works.  Like welding techniques, gauges also have different types and each is manufactured for a certain measurement.

Some check seam accuracy, while advanced ones like digital gauges offer more precise readings. Welders who know how to use these gauges not only produce welds of higher quality but also with minimum errors.

We will tell you everything you need to know about welding gauges, including their types, functions, how to use them, and much more.

What is a Welding Gauge?

A welding gauge is a welding tool used to measure different aspects of welding, including alignment, size, and precision.

It basically ensures that the weld is according to the required specifications set by the employer and standard organizations. A welder uses these welding gauges to inspect and measure everything before moving the piece to finishing.

It helps reduce welding defects that can be the cause of weaker structures later on. These are available in several forms, including the manual ones and up to the digital ones. Digital ones obviously provide better and precise readings.

It is used in different industries, such as shipbuilding, manufacturing, and construction, because these industries demand precise and error-free welds.

Also, these industries are very specific about their rules and regulations, so welding gauges help achieve the precision that will reduce future failures.

Features of a Welding Gauge

• Provide accurate measurements
• Has multiple uses
• Made of reliable materials
• Easily readable markings
• Compact and easy to carry

The advanced versions have additional features like automatic readings, storage of data, and LCD screens. These features ensure quick and easy readings that are even more precise.

Importance of Welding Gauge

Welding gauges offer so much more than just measuring different welding aspects with accuracy. It’s essential to use it because of different reasons, such as:

• They make sure the structure is strong. If there are incorrect measurements of size and the alignments are poor, they lead to weaker joints and, hence, weaker welds, leading to structural damage.
• By providing accuracy, they reduce the hassle of reworking and fixing things again and again. This not only saves so much time and effort but also a lot of money as you don’t have to use material and machinery.
• As mentioned, weaker welds mean the structural integrity is compromised. In future these structures can cause serious damages to humans, so if the measurements are precise, it ensure safety as well.
• There are so many industries (some of them are mentioned above) that are very strict regarding standard requirements. So, welding gauges make sure the welds are according to these standards.
• When you measure correctly, you will automatically see a faster turnaround and less waste of resources.

Now, let’s see three different types of welding gauges that are most commonly used in the welding industry and how to use each in the following section.

Types of Welding Gauges

Like welding techniques, gauges also have different types, and each is manufactured for a certain measurement. Some check seam accuracy, while the advanced ones, like digital gauges, offer more precise readings.

The three most commonly used welding gauge types are:

1.Fillet Welding Gauge

Fillet Weld Gauge

As the name indicates, this type of welding gauge measures the fillet weld size. This type of weld is very frequently used in structural welding and has a triangular shape.

Measuring the correct size of fillet welds makes sure that the weld quality and strength is optimum.

A welding gasue will tell you if the weld is meeting the appropriate throat thickness and length of the leg.

How to use fillet welding gauges? For measuring, place the fillet welding gauge against the weld and after taking readings, compare them with the needed size.

You need to make amendments if the size comes out too small or too large.

2.Welding Seam Gauge

Welding Seam Gauge

Well, welding seam gauges are basically designed to measure the uniformity and alignment of the weld seam.

They analyze the situation of the seam and check if the seam is even or not.

Also, they check if the seam is high or low. So, they are quite useful for the industries and welding projects where there is huge demand of even and smooth welds.

Two such industries are sheet metal work and pipelines industry.

3.Digital Welding Gauge

Digital Welding Gauge

These are advanced gauge aligning perfectly with the technological advancements. It gives precise measurements without manual work.

These welding gauges are very frequently use in high-accuracy industries like heavy machinery and aerospace.

Since they have a digital display, it is very easy to obtain and read precise measurements within seconds. Digital welding gauges reduce all the chances of human errors.

Apart from these three, there are some other types of welding gauges as well, including angle gauges, undercut gauges, and reinforcement gauges.

Angle gauge is for the measurement of weld angles, undercut ones measure the undercut depth, and reinforcement ones check how much reinforcement is above the weld seam.

So, each of these types has a purpose to fulfill. They not only measure with accuracy but provide better, cleaner, and efficient welding.

You can choose any of these types based on your task and industry requirements.

How to Use a Welding Gauge

You have understood by now that welding gauges are essential welding tools that measure the size, angle, and other aspects of welding with precision. However, using it appropriately makes all the difference. So, every welder must know how to use it. They must learn how to position it, how to read the measurements, and how to look for welding defects after measuring.

Since there are different types of welding gauges, they are used differently. But don’t worry, we will elaborate on how to use each down below:

1. Preparation

First, you must clean the weld surface thoroughly. It must be free of dust, debris, and slag as these things can influence the measurements. Clean the surface with the help of a grinder or a wire brush.

Select the right type of welding gauge to use based on the type of weld. For instance, there is a fillet welding gauge for fillet weld whereas the seam welding gauge is for seam weld.

Make sure the lighting where you are about to take the reading is very good so that you can correctly see the markings and minimize any chances of error.

2. How to Use Fillet Welding Gauges

• To check the fillet weld size, you need to pick the fillet welding gauge. First, you need to position the fillet welding gauge against the fillet weld. Place it in a way such that one side of the welding gauge is in contact with the base material, whereas the other one touches the weld.
• Now, confirm the leg length. There are cutouts in fillet welding gauges for weld sizes. So, you must align the welding gauge with the fillet weld to figure out if the length of the leg matches with the measurements required by the standard.
• Then, take reading of the throat thickness. There is a protruding arm in some fillet welding gauges for the throat thickness measurement. Place the protruding arm inside the weld and check the accurate size.
• Finally, all the readings are compared to analyze the weld. If the size comes too small, it means the weld is not strong enough. On the other hand, if it’s too large, it indicates the welder has used extra material, which will result in stress points.

3. Checking Weld Seam

• Well, you need to select an appropriate seam welding gauge to take readings of the uniformity and seam size. For this, align your gauge with the weld. Make sure it is positioned along the seam and also make sure that the placement is flat against the surface.
• Now, it’s time to check the height of the seam. The placed gauge will let you know the height of the seam. You can see if it’s high or low.
• After the height, measure the width of the seam. Measure it by making sure that the weld is fully covering the important area.
• Check thoroughly for welding defects, including inconsistencies, undercuts, excessive material, and others.

4. Digital Welding Gauge Usage

A digital welding gauge is an advanced gauge that automatically displays the reading without the manual work involved. To check the measurements, first, turn your digital welding gauge on.

• Make sure that it is turned on and showing proper calibrations.
• Now, position the welding gauge against the weld joint as needed.
• See the LCD screen as it will clearly show all the measurements very accurately, so there is no need for manual hassle.
• For future use and record, save the readings because there are some versions of digital welding gauge that offer this storage feature.

Some Mistakes to Avoid While Measuring

Mistakes are very common in any work, and so is the case with measurements. In fact, human errors in measurements are very common. Even experienced welders sometimes don’t take readings as accurate as they need to be. So, what are these mistakes? We have mentioned some of these below:

Taking Measurements Without Cleaning

It may seem a very tiny mistake, and welders often overlook this. They don’t clean the surface of the weld and material before using the welding gauge. But this mistake should be avoided.

The presence of dirt, debris, and dust impact the positioning of the welding gauge. In the presence of these tiny obstructions, the gauge will not sit properly against the weld.

This can affect the final readings. Also, when the surface is not clean, the alignment of the gauge won’t be proper. This leads to smaller or larger measurements than the original value.

How to Avoid?

• Make sure you clean the weld surface before placing the welding gauge.
• Take a wire brush or a grider for cleaning.
• Make sure that the surface is smooth and even for measurements to be taken.

Use of Wrong Welding Gauge

All welding gauges are not created equal. There are different types of these gauges, each serving a specific function and having a different method of use.

So, if a welder is a novice or mistakenly selects the wrong welding gauge, the measurement will never be accurate.

For instance, you must use a fillet welding gauge for fillet welds only and not for the seam welds because it is not the job of a fillet gauge.

If you say that instead of mixing welding gauges up, why not use a digital one?  Well, you cannot use an expensive tool for day to day inspections.

Manual welding gauges are preferably used for taking measurements during these situations.

How to Avoid?

• Learn and understand the difference between each gauge and their proper way of usage.
• Check if the welding gauge is compatible with the type of welding technique.
• Consult a senior or supervisor in case of confusion.

Wrong Welding Gauge Placement

Its important that the welding gauge is placed properly against the weld and weld seam. Why? Because it leads to misalignments and causes weaker welds.

This not only increases the chances of structural failure but also risks your safety. Also, placing the gauge wrong will sometimes lead to oversized welding, which takes a lot of time, effort, and material wastage.

How to Avoid?

• Double-check that you selected welding gauge is placed flat against the weld.
• Hold the gauge still for some time to see if it is aligning properly or not.
• Check the positioning once again before the measurement.

Ignoring Gauge Caliberation

With frequent use and mishandling, welding gauges lose their precision due to wear and tear and accumulation, particularly digital gauges. So, you have to make sure that the calibration of the welding gauge is accurate and not faulty because it leads to wrong measurement values. Resultantly, the welds will not come as good as they should be.

How to Avoid?

• Make it a habit to regularly calibrate the welding gauges according to the instructions from the manufacturers.
• If the wear and tear is too much, replace the manual welding gauges.
• Always keep the storage space clean and dry.

It’s quite important to avoid all these mistakes since they cause weaker welds, costly reworks, and structural failures.

So, you must follow good cleaning and storing practices. You must also learn which welding gauge is used for which purpose and make sure that the placement of the gauges is also correct and there is no misalignment.

By keeping these things under control, your welds will be smooth, cleaner, even, and defect-free, with no material wastage and no need for extra rework.

Fillet Weld Gauge vs Other Welding Gauges

We have discussed earlier as well that every welding gauge is designed differently to serve a different function. Here, we will see how the fillet weld gauge differs from other types. We will do a side-by-side comparison in a tabular form.

Now, we will compare the fillet weld gauge with the digital welding gauge and see their differences.

Let’s see the differences between the fillet weld gauge and the undercut welding gauge in the table below:

Choose the Right Welding Gauge

Since there are different types of welding gauges, it is difficult to select the appropriate one for your project. You need to consider certain factors before selecting the right one. In this section, we will discuss all those factors on which welding gauge selection is dependent.

1. Welding Type

So the welding type you are working on has a major impact in selecting the appropriate welding gauge. Different weld gauges have different functions, usage, and ideal use case scenarios that make sure the quality of welds is maintained.

For fillet welding, select the fillet weld gauge, as it will help you measure the size of the fillet weld by measuring the leg length and throat thickness. In the case of seam welding, go for a welding seam gauge because this one is more appropriate to cater to misalignments and accurately measure the width and height of the seam weld.

Shipbuilding, aerospace, automotive, and other industries demanding high precision can make use of digital welding gauges as they offer exact automated readings with no error. However, they are not used for daily inspections.

2. Precision & Accuracy

Another factor having a direct influence on gauge selection is the accuracy and precision required. Manual welding gauges like fillet and seam gauges are best suited for structural welding.

Whereas, industrial welding and high precision tasks need extreme accuracy so digital ones are the best choice for them as there is minimum chances of human errors using it.

3. Ease of Use

Welders are dealing with a lot of work and multiple projects at the same time so they prefer selecting the welding gauges based on the ease of use too.

For welders preferring a simple tool with no batteries and calibration checking, manual welding gauges are a good choice.

Whereas those working on high-precision tasks generally prefer digital welding gauges because they are easy to interpret. However, they must first learn how to use them properly.

4. Material & Durability

Welding gauges are available in different materials. You can select any based on the material and durability preference as well. Stainless steel gauges are long-lasting, strong, and famous for their corrosion-resistant properties.

So, they are a better choice from a long-term investment point of view. Aluminum ones are very portable and lightweight but prone to breakage because of bending and not corrosion resistant.

If you need a welding gauge temporarily, the aluminum welding gauge can be used appropriately.

Conclusion

A welding gauge is an important welding tool used to measure different aspects of welding, including accuracy, quality, and standard compliance.

Selecting the right type of welding gauge between fillet, seam, undercut, or digital welding gauge is up to you and the type of project you are handling. But make sure you select the one which offers more efficiency and accuracy according to your requirements.

There are different factors that also determine the selection of the right type of welding gauge, such as precision and accuracy, materials and durability, type of welding technique, and ease of use. No matter which of these types you choose, regular cleaning and upkeep are a must.

Manual gauges are much simpler and easier to operate but are quite difficult to interpret. On the other hand, digital one is tricky to operate but it’s reading and interpretations are very easy, quick, and automatic.

Lastly, select a reliable welding gauge manufacturer in China for welding gauge purchase.