API-577 무료 덤프문제 온라인 액세스

Which of the following weld flaws is described as a subsurface terrace and step-like crack weakened by dispersed planar-shaped inclusions?

• A.Hot cracking
• B.Lamellar tearing
• C.Hydrogen cracking
• D.Sulfite stringers

In hardness testing of carbon steel weldment specimens, there is an approximate relationship between hardness and:

• A.Toughness
• B.Yield strength
• C.Tensile strength
• D.Ductility

Steels usually require both preheat and PWHT if they have a carbon equivalent higher than:

• A.0.55
• B.0.35
• C.0.50
• D.0.45

The simplest weldability tests are those that evaluate:

• A.Ductility and hardness of the weld.
• B.Strength and ductility of the weld.
• C.Porosity and slag inclusions of the weld.
• D.Cracking and corrosion resistance of the weld.

Which of the following is a practical solution that could prevent or reduce lack of fusion in carbon steel during the weld process?

• A.Reduce travel speed
• B.Use proper joint design
• C.Avoid excessive weaving
• D.Provide proper heat input