Content In Weld Metal Research Articles

電子顕微鏡による熔着金属中の非金属介在物の研究(第1報)

Total oxygen content in weld metal is usually several times higher than in general rolled steel. Oxygen content which is soluble in matrix is extraordirary low, therefore almost oxygen exists in the form of non metallic inclusions. Attempts have been made to extract non-metallic inclusions to carbon film to be studied with on electron microscope. By the electron microscope the very minute non-metallic inclusions such as smaller than lμ can be direct observed. The size, shape, constituents ahd other characteristics of non-metallic inclusions have been determined by means of electron diffraction method and direct observation. The author tried to obtain rather simple non-metallic inclusions and used single deoxidizer such as silicon, manganese, titanium, etc. The core wire, its carbon content is very low and its silicon and manganese contents is reduced to neglsible small, was used in this investigation.

Austenite系Cr-Ni不銹鋼熔着金属の亀裂感受性に及ぼす燐の影響

The effect of phosphorus on crack-sensitivity of austenitic Cr-Ni stainless steel weld metal is investigated with the segmented-circular groove test process. The test results indicate that the effect depends on ferrite content in weld metal and phosphorus is allowable up to 0.05%, 0.10%, 0.13%, 0.15% each 3%, 7%, 9%, 12% ferrite level calculated in accordance with schaeflier's data.