Free ASME Principles of Welding Questions and Answers

Question 1

Square wave refers to the ____________.

Accepted Answer

shape of the output power

Answer

Explanation:
The shape of the output waveform from this type of power source is referred to as square wave. These types of power sources have enhanced performance on a.c. They can control the balance, amplitude, frequency, etc. to allow better control of penetration and cleaning action.

Question 2

Shielding gases are used to protect the molten metal from _______.

Accepted Answer

porosity and brittleness

Answer

Explanation:
The surrounding air around the weld pool contains oxygen, nitrogen, and hydrogen. These gases get into the molten weld pool and cause gas bubbles to form (porosity) and lead to embrittlement and weld cracking.

Question 3

Weld backing is used with a process that uses a separate flux and electrode to _______.

Accepted Answer

support the highly fluid weld pool so it will not fall through the joint

Answer

Explanation:
Weld backing is used on the back side of the joint to prevent melt-through and to ensure complete penetration of the weld joint.

Question 4

If a liquid weld pool is at a very high level of energy, at what approximate temperature will the steel begin to solidify?

Accepted Answer

2780 F

Answer

Explanation:
When welding, the melting point of steel (approx. 27800 F) versus the solidification point of the fast freezing flux or slag (approx. 32000 F) is important to know. Also, it is important to know that the melting point varies with the carbon and alloy content of steel. Steel is magnetic until heated above the transformation temperature of approximately 1333 0 F. How fast the metal conducts heat will have a large effect of preheat and inter-pass temperature control. How much the metal expands on heating and contracts when cooling needs to be understood to control buckling and distortion.

Question 5

__________ is a groove melted into the base metal next to the weld toe or weld root and has not been filled in.

Accepted Answer

Undercut

Answer

Explanation:
Undercut best describes this fashion. Some people want to call it “under fill” but it is not correct, since it is not in the weld being located next to the toe.

ASME - American Society of Mechanical Engineers Practice Test

ASME - American Society of Mechanical Engineers Practice Test

Free ASME Principles of Welding Questions and Answers