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51312-01235-Repair Welding of Centrifugally Cast Ethylene Furnace Tube

Tube coils in a radiant section of an ethylene cracking furnace are subject to corrosion.  Repair welding of these tube coils is difficult. A degraded tube section is replaced by welding in a virgin tube section. The current paper presents the test results of a weld joint between a service-exposed tube and virgin tube using automatic orbital and manual gas-tungsten-arc welding (GTAW) processes.

Product Number: 51312-01235-SG
ISBN: 01235 2012 CP
Author: Bingtao Li
Publication Date: 2012
$0.00
$20.00
$20.00

The tube coils in the radiant section of an ethylene cracking furnace are subject to creep deformation carburization and oxidation. These tubes are typically made of centrifugally cast Ni-Cr alloys with high levels of carbon and chromium along with micro alloying elements such as Nb Ti etc. The repair welding of these tube coils can be quite challenging when a service-degraded tube section is replaced by welding a virgin tube section to the existing tube coil. The current paper presents the test results of a weld joint between a service-exposed tube and virgin tube using both automatic orbital and manual gas-tungsten-arc welding (GTAW) processes. A service-exposed tube was removed from a tube coil made of a 35/45 micro alloy after 3-1/2 years of service. The weld joints were evaluated by dye penetration testing optical microscopy and tensile testing at both room and elevated temperatures. The results of the evaluation on the quality and properties of the weld joints will be presented by comparing the weld joints made by automatic orbital welding with those made by manual welding.

Keywords: downloadable, Ethylene Furnace Tube, Micro-Alloy 35-45Nb MA, Welding Repair, Automatic, GTAW

 

 

The tube coils in the radiant section of an ethylene cracking furnace are subject to creep deformation carburization and oxidation. These tubes are typically made of centrifugally cast Ni-Cr alloys with high levels of carbon and chromium along with micro alloying elements such as Nb Ti etc. The repair welding of these tube coils can be quite challenging when a service-degraded tube section is replaced by welding a virgin tube section to the existing tube coil. The current paper presents the test results of a weld joint between a service-exposed tube and virgin tube using both automatic orbital and manual gas-tungsten-arc welding (GTAW) processes. A service-exposed tube was removed from a tube coil made of a 35/45 micro alloy after 3-1/2 years of service. The weld joints were evaluated by dye penetration testing optical microscopy and tensile testing at both room and elevated temperatures. The results of the evaluation on the quality and properties of the weld joints will be presented by comparing the weld joints made by automatic orbital welding with those made by manual welding.

Keywords: downloadable, Ethylene Furnace Tube, Micro-Alloy 35-45Nb MA, Welding Repair, Automatic, GTAW

 

 

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