Qualifying Fillet Welds: What Kind Is Acceptable?

When designing a weld, several factors must be taken into consideration such as the weldability of the base metal, the matching of welding materials and the base metal, welding efficiency, the welding method, the size of the weld bead, welding deformation, and buckling of the joint plate.

Related reading: The Ultimate Guide to Welding

Let’s consider fillet weld beads as an example.

As per the American Welding Society Steel Structure Welding Code (AWSD1.1), fillet weld beads are classified into three categories, which are ideal weld bead, acceptable weld bead width, and unacceptable weld bead.

Inadequate throat depth of fillet weld bead, excessive convex surface, welding corrosion, overlap, insufficient leg length, and poor fusion are considered incorrect weld bead dimensions.

The minimum size of the fillet weld bead is also specified in the Steel Structure Welding Regulations of the American Welding Association and China’s Technical Code for Design of Steel Structures of Steel Buildings. Table 4 illustrates the minimum size of fillet weld bead.

The minimum leg length of fillet welding is determined by the thicker plate of the two parts of the joint, but it should not be greater than the thickness of the thinner plate.

If the minimum leg length is exceeded, sufficient preheating should be provided to ensure the welding quality.

Related reading: Welding Quality of Welded Joints

If stress calculations dictate, the size of the welding can exceed the thickness of the thin plate in the joint.

Table 3 lists the minimum leg length of fillet welding for different plate thicknesses, while Table 4 demonstrates the correlation between the full pass width of fillet welding and the maximum length of the convex face.

Table 3 Minimum angle length of fillet weld bead

Thickness of thicker plate at joint, t (mm)Minimum leg length of fillet weld (mm)
t≤63
6<t≤125
12<t≤196
19<t≤388

Table 4 Relation between the full pass width and the maximum convex length of fillet welding

Full weld bead width, wMaximum convex face length, c
w≤8mm1.6mm
8mm<w≤25mm3mm
25mm<w5mm
Don't forget, sharing is caring! : )
Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

Up Next

Mastering CAD/CAM: Essential Technologies Explained

Basic Concepts of Computer-Aided Design and Computer-Aided Manufacturing Computer-aided design and computer-aided manufacturing (CAD/CAM) is a comprehensive and technically complex system engineering discipline that incorporates diverse fields such as computer [...]

Virtual Manufacturing Explained: Concepts & Principles

Concept of Virtual Manufacturing Virtual Manufacturing (VM) is the fundamental realization of the actual manufacturing process on a computer. It utilizes computer simulation and virtual reality technologies, supported by high-performance [...]

Understanding Flexible Manufacturing Systems: A Guide

A Flexible Manufacturing System (FMS) typically employs principles of systems engineering and group technology. It connects Computer Numerical Control (CNC) machine tools (processing centers), coordinate measuring machines, material transport systems, [...]

Exploring 4 Cutting-Edge Nanofabrication Techniques

Just as manufacturing technology plays a crucial role in various fields today, nanofabrication technology holds a key position in the realms of nanotechnology. Nanofabrication technology encompasses numerous methods including mechanical [...]

Ultra-Precision Machining: Types and Techniques

Ultra-precision machining refers to precision manufacturing processes that achieve extremely high levels of accuracy and surface quality. Its definition is relative, changing with technological advancements. Currently, this technique can achieve [...]

Exploring High-Speed Cutting: Tech Overview & Application

Cutting machining remains the most prominent method of mechanical processing, holding a significant role in mechanical manufacturing. With the advancement of manufacturing technology, cutting machining technology underwent substantial progress towards [...]

Top 7 New Engineering Materials: What You Need to Know

Advanced materials refer to those recently researched or under development that possess exceptional performance and special functionalities. These materials are of paramount significance to the advancement of science and technology, [...]

Metal Expansion Methods: A Comprehensive Guide

Bulge forming is suitable for various types of blanks, such as deep-drawn cups, cut tubes, and rolled conical weldments. Classification by bulge forming medium Bulge forming methods can be categorized [...]
MachineMFG
Take your business to the next level
Subscribe to our newsletter
The latest news, articles, and resources, sent to your inbox weekly.
© 2024. All rights reserved.

Contact Us

You will get our reply within 24 hours.