Understand 7 Types of Welding Joints – My Welding Yard

Understand 7 Types of Welding Joints - My Welding Yard

Welding joints is all about joining two metal fragments together. For a new welder its important to understand the types of welding joints because without it you cannot grasp the welding as a skill.

This process inclines the welder to construct and create strengthen connections in designing quality welds in fabrication. These welding joints are applicable for lightweight as well as heavyweight uses; some are expensive to generate quality welds while most of them are affordable.

Each welding joint comes up with its own pros, cons, and variety of applications.  Apprehending the terminology of welding joints is a bit challenging. You are learning vital gear to know which type of welding joint suits the best way for your project.

Without a thorough guide or significant experience, it can be challenging So, My Welding Yard has done this job for you. Go on and create yourself sound with the knowledge of welding joints, their differences, and what to watch for when welding them.

Various types of Welding Joints with Diagrams

It is significant to highlight the two conventional and continuous welds labelled as butt-welding joint and fillet welding joints. A person with sound welding knowledge is able to distinguish the differences between the two amazing welding joints along with the areas of its application.

1.Buttweld Joint

butt weld joint

The assembly describing butt weld is positioning the different plates pushing hard against each other by flushing their tops. Two plates, when butt up to each other are in general, aligned straightly. This type of weld can have sections cut out of the corners of the plates in various shapes and sizes.

These are called weld preps and are added to provide more depth of weld to the joint. The joint can also have two square ends without any weld prep. Butt joints appear by means of butt welds. The adjoining of two plates by levelling their tops and bottom forms butt joint.

The butt joint is the most challenging joint to achieve in reason with the less visual control to place straight welds. To provide strong efficiency to the butt joint, butt welds are added with deep penetration. Butt joint has found itself essential in the fabrication of welded pipe systems. You May Also Like: Best Plasma Cutter

This one is the most comprehensive method of connecting fittings, flanges, valves, and other tools. To check the quality of the weld, X-ray techniques are widely applied. Butt Joint weld types take in Square butt, Bevel groove, V-groove, J-groove, U-groove, Flare-V-groove, and Flare-bevel-groove butt weld.

A joint in a horizontal position will require considerably more practice than the previous techniques. It is, however, important that the technique be mastered before passing on to other types of weld positions.

Horizontal butt joint
Horizontal Butt Joint

For positioning the butt weld in a vertical position, it is necessary to pointer the flow of metal upwards at a 45-degree inclination to the plate underworking. During so, the placement of the rod should be in between the flame and the molten puddle.

Handling good control of torch and filler rod provides better penetration and preventing the metal from falling. Both the torch and the welding rod should be oscillated to deposit a uniform bead. The welding rod should be held slightly above the centerline of the joint, and the welding flame should sweep the molten metal across the joint to distribute it evenly.

Vertical Butt Joint ,Types of Welding Joints

Vertical Butt Joint

Giving a general idea of how overhead butt joint can be made by means of torch and welding rod

Overhead Butt Joint

Overhead Butt Joint Placement

For better penetration, keep the following illustrations in practice


Complete Penetration at weld joint

Complete Penetration Weld


Partial Weld Joint

2.Fillet Welding Joint

Fillet Welding Joint

Fillet Joint

The position of the fillet joint lies inside the corners of adjoining plates. The angle at which this joint is fitted lies within the angle range of 90 degrees up to the angle of 145 degrees. In general, the corner is at right angles. The name “fillet” was adopted from the traditional old word that was once used to describe the section having a triangular shape.

More or less similar to the shape of the inside angle you weld a fillet weld into. This concept of adjoining is quite easy to apprehend and remember from the word “fill it” any corner to fill the weld with. Fillet welded joints such as Tee, lap, and corner joints are the most common connection in welded fabrication.

In arc welding, these joints make up more or less 70 to 80 % of all joints. In general, fillet welds are usually cheaper than butt welds.

In pipe systems fillet welded joints are largely used for joining pipe to socket joints and in systems where Slip-On flanges will be used. The image below illustrates typical fillet welded joints in a Socket Weld pipe system.

3.Tee joint

T Joint,Types of Welding Joints

Tee Joint

The tee joint is the connection placed in T position from where it acquires the name as “TEE”. To observe this joint is pretty simple. The joint is easy to apprehend representing one metal surface that is flat in nature, lays down while another piece is welded in an upward direction on the side or end of the flat-lying surface.

Tee weld appears to be a bit easy, but its execution is more challenging in practice. It inclines to be more stimulating after pulling a weld when the irregular surface hampers in providing a surface area to hold it in a right-angle direction. The weld can be made stronger by employing the welds on both lengths of the vertical plate in combination with the ends welded, transforming its four edges fused to the base plate just in a similar pattern s represented below.

Tee welding joints are fashioned at an angle of 90 degrees, adjoining the two members being welded, making them aligned with respect to the base plate. Numerous applications of Tee joints are considered in welding a pipe or a tube onto a base plate. To ensure effective penetration, additional maintenance in the roof of the weld is obligatory.

Horizontal Tee Joint,Types of Welding Joints
A fillet weld on a tee joint in the horizontal position

These welds, when pulled out results in distorting the metal surface. During the process of welding tee joint, you will need a certain angle for the standing plate, for example, you tack it at the right angle. It is quite possible that the weld you have just made would always pull towards the side you welded first.

To prevent this from happening, you must be aware of the course to be followed while carrying out these welds. Let me describe an exceptional way of placing smooth and stronger Tee welds. Pin the position of the plate in the direction of a right angle.

Surrounding the positioned plate by means of braces will avert the dislocation of the positioned plate. Once there are enough braces to stop it from moving, monitor the four steps of completion. Weld the joint fully, wait for it to cool, cut the braces off (ensuring you do not cut into the job), and grind off the weld with a soft grinding disk, like a flapper wheel, to leave a clean finish.

This method facilitates in performing smaller jobs, but its vital application deals with straitening off the larger sections where constructing weld is challenging.

Another opportunity of providing the best finish to the Tee joint is as shadowed. Fastened the plate on a slight angle away from the side you will weld first so that when you fuse it, it pulls into the position it needs to be in. the technique entails experience to master.

After you are done with the weld, measure the correctness of the angle by various measuring tools. In case, your angle is not rightly welded, pat the welded plate with a soft hammer to encourage it into the desired position. Hot welds are easy to position.

Make sure it’s bending at the weld, not bending a crease in the plate above the weld. Using a steel hammer will cause indentation into your plate when you hit it.

4.Square Joint

square joint

Square Joint

The square joint represented by the symbol L is somewhat similar to the Tee joint. Consider two plates A and B held in an assembly in which plate A lays flat, while plate B stands on its tip flush with plate A’s end to get butt welded together.

A fillet weld is placed on the other side of the plate between the right angle. The dimensions of plates A and B, such as length, width, and thickness can be measured equal or different.  A square joint can be made by welding either one end of plate A welded with plate B, subjected to the application of the project.

Since the shape of the square is accompanied by a right angle, thus referring to this type of joint named ‘square joint’.

Square joints are not as sturdy as the Tee joints.  Tee joints are bordered by two fillet welds on either side, whereas the square joint has a fillet weld on one side and butt weld on the other. This assembly in square joints causes uneven strength. Have A Look at : Best Welding Respirators 

Whereas in the Tee joint, the opposite adjustment of butt weld tends to increase the strength of the joint. One of the major defects in placing a Square joint is that it does not support the lengthy plates, influencing the mechanical properties of adhesive joints.

5.Lap Joint

lap joint

Lap Joint

The assembly followed by a lap joint is the overlapping of one plate over another, parting two sections for fillet welds, one on the top and one underneath. Lap joint offers greater surface area between the two welds making it the most trustworthy welding connection.

In practice, I found its execution quite. The term “lap joint” thinks up its name from the word “overlap.”  Two plates of varying thickness could be joined together by means of lap joint welding. Lap joints are also a kind of fillet weld, that can be made on both sides.

A good welder need not worry if he is practicing lap joint welding in an accurate position. Incorporating the lap joint onto your project would ultimately add up more strength and strong placement of overlapping plates. One prevention measure should be considered by not placing more heat into the weld, which may result in the distortion of the overlapping plates.

Lap joint finds its application in the electron beam, gas Tungsten arc weld, and gas metal arc welding. These welds can be used to hold a variety of exercise machines and industrial tools. In the field of automation, plastic, wood, and in assembly framing progressions. Giving a broad idea to the different types of lap joint welding summed up.

  • Fillet weld
  • Bevel-groove weld
  • J-groove weld
  • Plug weld
  • Slot weld
  • Spot weld
  • Flare-bevel-groove weld

6.Edge Joint

edge joint

Edge Joint

When two plates assemble themselves in a face-to-face position somewhat similar to the lap joint with the alteration of joined edges, the edge joint comprises of one butt weld alongside three other welds that may be devoted by either fillets or butt welds.

The functioning of the edge welding joint is often applied in attaching two adjacent plates or parts of metal sheets with flange edges. These joints are essential when the plates being joined have a thickness of less than 3-mm. At times to strengthen the connection filler metal is added to melt or fuse the edge completely.

Weld types in edge joint implicate welds like butt, bevel-groove, V-groove, J-groove, U-groove, edge flange, and corner-flange welds. The edge joint is also amidst the solid joints that provide large surface area clamped between the welds. An edge weld can be made attractive by using weld preps. This practice would gift a nice finish to the weld.

7.Corner Joint

corner joint

Corner Joint

When the corners of two plates coincide than the resulting joint is termed as “Corner joint”.  The formation of the big V between the two corners depicts its weak assembly. The geometry followed between two corners is usually a 90-degree angle that can be varied.

Occasionally, the inner side of the corner weld is not welded, but when stitched strongly, it can yield a smooth concave finish that looks creative. Its application is applied in carrying low load uses and briefly in sheet metal works. In designing boxes, frames, and similar types of fabrication, corner joints are frequently practiced.

Frequently Asked Questions FAQs

What is the strongest weld joint?

Fillet welding joints made by TIG welders is the strongest juncture in reason with the high penetration loading of hot metal into the joint. These welds appear more aesthetic because TIG welders make use of filler metal going directly into the weld joint yielding strong connections.

What are the basic welding joints?

Five types of welding junctures that have several applications in the ground of fabrication. They are summed up as
• Butt Joint
• Corner Joint
• Edge Joint
• Lap Joint
• Tee joint


Welding is a great skill that can be mastered by means of practice. To market this skill of yours, you need to stand high in the crowd by welcoming every opportunity to get hands-on experience by means of consistent practice. Welding has now expanded itself to serve a wider audience, including large sectors such as transportation and agriculture.

This rise in demand for welders across the board is making the people ready to learn and practice the art. We must appreciate this work, as the welding process is very sensitive in terms of cost, time, and even lives. The ability to make strengthen welds requires consideration of direction forces that would be practiced to produce high-quality welds.

Grasping the various types of welding joints is essential for anyone who is interested in constructing top quality structures. This is only the beginning of your long journey that will ensure your sustainable relevance in the fast-growing industry.

I hope now you have understood the concept of various welding joints and can move forward amazingly!

Hello Everyone, I am James from Kentucky and been into this welding fiasco for 13 years in that time I have worked as a private welder and did most of the auto restoration work. In this recent, COVID-19 outbreak I decided to start a welding blog and share welding tips along with product reviews.

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