Papers by Author: Song Nian Lou

Abstract: By means of FISICO test, the cracking susceptibility of the 6061 aluminum was investigated, the experimental results showed that it is prone to form crater crack under restraint condition comparison with that of the 3003 aluminum. So the crater fill-up technology need to be employed accordingly during the field welding. The strength, elongation percentage and hardness of the as welded joint was lowered 29.7%
40%42% respectively, the former two is recovered to 73.4% and 81.7% of the base material respectively after natural aging 30days. This indicate that the natural aging treatment can remedy part of the property loss during the welding.

Abstract: The wire for high strength and toughness TMCP steels of submerged arc welding was developed. The low carbon and micro-alloying with Ti-B system was adopted to obtain the acicular ferrite dominated deposited metals. Experimental results show that the carbon equivalent (Pcm) should be higher than 0.17, which can ensure the high strength and high toughness of the deposited metals. In the alloy system, Oxygen and Nitrogen contents, micro-alloyed elements (C, Mn) and its mixture ratio are the key factors that affect the deposited metals toughness. With increasing C, Mn content, the acicular ferrite is increased and toughness is improved. Oxygen and Nitrogen are deleterious to the toughness of deposited metals.