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Unmixed Zone in Arc Welds
Carl D. LundinW. LiuG. ZhouC. Y. Qiao
其他書名
Significance on Corrosion Resistance of High Molybdenum Stainless Steels
出版Welding Research Council, 1998
主題Science / General
ISBN158145435X9781581454352
URLhttp://books.google.com.hk/books?id=IpypSgAACAAJ&hl=&source=gbs_api
註釋The nature and the effect of the unmixed zone in dissimilar fusion welds, especially its significance with regard to corrosion resistance, has been studied in this Welding Research Council-sponsored program. Three types of super-austenitic stainless steel (high Mo) (AL-6XN, 254SMO and 654SMO) and five types of fully austenitic nickel-based weld filler metals (Inconel 625, C-22, C-276, 686CPT, and P16) were evaluated. Shielded metal arc (SMA), gas metal arc (GMA), gas tungsten arc (GTA) (filler added), and gas tungsten arc (GTA) autogenous welding processes were used for fabricating weldments of each super-austenitic stainless steel. The employment of these welding techniques provided a full range of unmixed zone formation. The unmixed zone formation was metallographically evaluated using both optical light microscopy (OLM) and scanning electron microscopy (SEM) with varied etchants and etching techniques. The pitting corrosion behavior of the unmixed zone was evaluated using immersion corrosion tests in 10% FeCl3.