API-577 無料問題集「API Welding Inspection And Metallurgy」

（A）Base metal and group number

（B）Electrodes and welding rods

（C）Electrode diameter and strength

（D）Chemical composition of the deposited weld metal

（A）2.5 in. (63.5 mm)

（B）3.5 in. (90.0 mm)

（C）3 in.(76.2 mm)

（D）1.5 in. (38.0 mm)

（A）Yield strength

（B）Toughness

（C）Ductility

（D）Tensile strength

（A）Low-hydrogen electrodes may be stored in ovens with cellulose-based electrodes, but must be in their original, unopened containers.

（B）Electrode ovens should be heated by any means, but must have automatic heat controls and visible temperature indicators.

（C）Low-hydrogen electrodes should never be stored with stainless-steel electrodes.

（D）Electrodes should never be stored in an oven that is used for food storage.

（A）Electrode characteristics

（B）Comparable base metal characteristics

（C）Chemical composition of the base metal

（D）Weldability characteristics of base metal

（A）The weldability of a steel, based on carbon content.

（B）Whether preheat will be needed.

（C）Whether postweld heat treatment (PWHT) will be needed.

（D）The theoretical carbon content of a steel.

（A）Physical properties of the final weldment can be significantly affected by preheat and postweld heat treatment (PWHT).

（B）A thorough knowledge of weld metal structures is necessary to understand weldability.

（C）The crystalline structure of base metals affects the resulting structure of the weld.

（D）Welding processes can affect both mechanical and corrosion properties of a weldment.

（A）Transverse to the weld.

（B）In the HAZ.

（C）In the undercutting.

（D）Parallel to the weld.

（A）In sealed plastic containers.

（B）Under low humidity conditions.

（C）In warm holding ovens.

（D）In tightly sealed ovens.

（A）Tendency of weld pool to be sluggish

（B）Excessive distortion

（C）Solidification cracking

（D）Deflection of the weld arc