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Chapter 6: Weld Joints and Weld Types

The basic joint often is changed to assist in a component’s assembly. A weld joint might be modified to gain access to the weld joint or to change a weld’s metallurgical properties. Some common weldment configuration designs are described here. Joggle-type joints are used in cylinder and head assemblies where backing bars or tooling cannot be used. See Figure 6-8. Another application of joggle joints is in the repair of unibody automobiles where skin panels are placed together and welded. | This sample chapter is for review purposes only. Copyright © The Goodheart-Willcox Co., Inc. All rights reserved. 58 6 CHAPTER Weld Joints and Weld Types Gas Metal Arc Welding Handbook Butt Bevel-groove J-groove Objectives After studying this chapter, you will be able to: • Identify different types of welds used with various joints. • Read and draw common welding symbols. • Discuss advantages and disadvantages of different weld joints. • List factors involved with joint design. Joint Types The American Welding Society defines a joint as “the manner in which materials fit together.” As shown in Figure 6-1, there are five basic types of weld joints: • Butt joint. • T-joint. • Lap joint. • Corner joint. • Edge joint. Butt T Lap Corner Edge Figure 6-1. The five basic types of joints used in welding. Joint Preparation Weld joints may be initially prepared in a number of ways. These include: • Shearing. • Casting. • Forging. • Machining. • Stamping. • Filing. • Routing. • Oxyacetylene cutting (thermal cutting process). • Plasma arc cutting (thermal cutting process). • Grinding. Final preparation of the joint prior to welding will be covered in the chapters that detail the welding of specific materials. U-groove Plug Flare-V Flare-bevel Figure 6-2. Types of welds that may be made with a basic butt joint. Bevel-groove J-groove Fillet Flare-bevel Slot Plug Figure 6-3. Types of welds that may be made with a basic T-joint. 57 J-groove Bevelgroove Slot Spot Figure 6-4. Types of welds that may be made with a basic lap joint. Weld Types There are various types of welds that can be made in each of the basic joints. They include: Butt joint, Figure 6-2. • Square-groove butt weld. • Bevel-groove butt weld. • V-groove butt weld. • J-groove butt weld. • U-groove butt weld. • Flare-V-groove butt weld. • Flare-bevel-groove butt weld. T-joint, Figure 6-3. • Fillet weld. • Plug weld. • Slot weld. • Bevel-groove weld. • J-groove weld. • .