STRENGTH EVALUATION METHOD OF JUNCTION TYPE VALVE SEAT

摘要

PROBLEM TO BE SOLVED: To provide a strength evaluation method of a junction type valve seat capable of measuring strength distribution along the whole circumference of the valve seat by measuring local junction strength along the circumference of the junction of a ring-shaped valve seat. SOLUTION: In this strength evaluation method of the junction type valve seat formed by heating and pressure welding the ring-shaped valve seat material on the valve port peripheral fringe of a cylinder head to joint the material metallurgically, a test piece is cut out by cutting the cylinder head 2 into a sheet shape on a section Q including the junction, and a strength test is executed on the test piece.