Chapter 30

Name the principal groups of processes included in fusion welding.

What is the fundamental feature that distinguishes fusion welding from solid-state welding?

Define what an electrical arc is.

Electrodes in arc welding are divided into two categories. Name and define the two types.

What are the two basic methods of arc shielding?

Describe the shielded metal arc-welding (SMAW) process.

Why is the shielded metal arc-welding (SMAW) process difficult to automate?

Define resistance welding.

What are the desirable properties of a metal that would provide good weldability for resistance welding?

Describe the sequence of steps in the cycle of a resistance spot-welding operation.

What is a sonotrode in ultrasonic welding?

Distortion (warping) is a serious problem in fusion welding, particularly arc welding. What are some of the techniques that can be taken to reduce the incidence and extent of distortion?

What are some of the important welding defects?

What are the three basic categories of inspection and testing techniques used for weldments? Name some typical inspections and/or tests in each category.

What are the factors that affect weldability?

What are some of the design guidelines for weldments that are fabricated by arc welding?