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02388 NEW WELD OVERLAY PROCESS AND EVALUATION OF CORROSION-RESISTANCE IN WTE BOILER ENVIRONMENTS

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Product Number: 51300-02388-SG
ISBN: 02388 2002 CP
Author: Yuuzou Kawahara, Xiangyang Li, Yuuji Nakagawa, Hiroshi Imaizumi, Toshio Kato, and Hideaki Nakajima
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In order to improve the durability and cost performance of weld overlay superheater tubes used in high efficiency waste-to-energy boilers, a reverse polarity plasma arc welding process was developed. Evaluation of the high-temperature corrosion-resistance was carried out by using a thermal gradient corrosion test method and by a 4000 hour field corrosion test in a high-efficiency waste-to-energy boiler supplying 500°C/9.8MPa steam. From these evaluations, good corrosion-resistance which is equal to conventional weld overlay processes, or more, was confirmed. Especially with a newly developed process, localized corrosion arising in the bonding part of SA178/weld metal and selective corrosion of the weld metal were less than conventional welding processes due to it's lower dilution and heat input. Keywords : weld overlay, waste-to-energy plant, superheater tube, alloy 625, alloy 310, corrosion-resistant materials, reverse polarity plasma arc welding, thermal gradient corrosion test, field corrosion test, locarized corrosion, corrosion life evaluation
In order to improve the durability and cost performance of weld overlay superheater tubes used in high efficiency waste-to-energy boilers, a reverse polarity plasma arc welding process was developed. Evaluation of the high-temperature corrosion-resistance was carried out by using a thermal gradient corrosion test method and by a 4000 hour field corrosion test in a high-efficiency waste-to-energy boiler supplying 500°C/9.8MPa steam. From these evaluations, good corrosion-resistance which is equal to conventional weld overlay processes, or more, was confirmed. Especially with a newly developed process, localized corrosion arising in the bonding part of SA178/weld metal and selective corrosion of the weld metal were less than conventional welding processes due to it's lower dilution and heat input. Keywords : weld overlay, waste-to-energy plant, superheater tube, alloy 625, alloy 310, corrosion-resistant materials, reverse polarity plasma arc welding, thermal gradient corrosion test, field corrosion test, locarized corrosion, corrosion life evaluation
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