| 摘要 |
PURPOSE:To prevent a crack from being caused in a surface build up welding layer by forming nonmagnetic alloy as a first build up welding layer and forming alloy which is made amorphous by rapid cooling coagulation thereon as a second build up welding layer and impressing high-intensity energy on this layer to perform rapid redissolution and rapid coagulation and forming an amorphous pattern. CONSTITUTION:Nonmagnetic alloy free from martensitic transformation is formed as a first build up welding layer 5 on an iron-based alloy base body 1 which causes martensitic transformation. An alloy layer 6 is formed between both. Alloy which is made amorphous by rapid cooling coagulation is formed as a second build up layer 10 thereon. An alloy layer 11 is formed between both. High-intensity energy (laser) 13 is impressed on the second build up layer 10 to perform rapid dissolution and rapid recoagulation and an amorphous pattern 14 is formed. Thereby the strength difference of an output signal is made large in detection of the magnetic characteristics in the amorphous part or the crystalline part on the surface build up welding layers. |
