Weldment Configurations
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. A built-in backing bar is used when
enough material is available for machining the required
backing or when tooling cannot be inserted (as in some
tubular applications). An example in which tubing is
being joined to heavy wall tube is shown in Figure 6-9.
Pipe joints often use special backing rings or are
machined to fit specially designed mated parts. Types of
backing rings are shown in Figure 6-10. Figure 6-11
shows a fabricated backing bar. These bars must fit
tightly or problems will be encountered in heat flow and
penetration. Weld joints specially designed for controlled
penetration are used where excessive weld penetration
would cause a problem with assembly or liquid flow. This
type of joint is shown in Figure 6-12.
Chapter 6 Weld Joints and Weld Types 59
Butt
Fillet J-groove
Spot V-groove Edge
Corner
flange
Flare-V
Figure 6-5. Types of welds that may be made with a basic
corner joint.
Butt Bevel-groove J-groove V-groove
U-groove Corner flange Edge flange
Figure 6-6. Types of welds that may be made with a basic edge
joint.
Butt Bevel V-groove
J-groove
U -groove
Bevel and fillet Fillet
Double fillet
Figure 6-7. Applications of double welds.