Lesson 3: Basic Use of an Arc Welder

Why should the metal to be welded be clean?

• To make the welding process faster

• To reduce the strength of the weld

• To prevent the mixing of impurities with welding fumes to form toxic gases

• To improve the appearance of the weld

What can impurities on the metal surface do to the weld?

• Improve the strength of the weld

• Have no effect on the weld

• Reduce the strength of the weld

• Change the color of the weld

Which of the following is NOT a method for cleaning base metal for welding?

• Grinding

• Wire brushing

• Painting

• Sand blasting

What minimum thickness of metal should be beveled before welding to increase the penetration of the weld?

• 1/8 in.

• 1/4 in.

• 1/2 in.

• 3/4 in.

Which of the following is NOT a method for beveling metal?

• Flame cutting

• Grinding

• Machining

• Soldering

Which of the following is NOT a bevel design used in welding?

• Single V-groove

• Single bevel

• Triple V-groove

• Double bevel

What is one of the factors for choosing the bevel in welding?

• Color of the joint

• Position of the joint

• Brand of welding equipment

• Type of welding mask

What is the maximum thickness allowed for the metal plates in the single bevel butt weld configuration?

• 1/4 inch

• 1/2 inch

• 3/4 inch

• 1 inch

What angle is used for the bevel in a single v-groove butt weld?

• 45 degrees

• 60 degrees

• 90 degrees

• 30 degrees

Which of the following configurations uses a backing bar?

• Single bevel

• Double bevel

• Single v-groove

• Single bevel with backing