scholarly journals Analysis of Temperature Change of Tunnel Lining with Heating Element

2017 ◽  
Vol 18 (1) ◽  
pp. 5-12 ◽  
Author(s):  
Hyunwoo Jin ◽  
Teasik Kim ◽  
Youngcheol Hwang
Keyword(s):  
Temperature Change ◽  
Tunnel Lining ◽  
Heating Element

Selective Corrosion of brazed joint between BNi-2 filler metal and stainless steel 316

1996 ◽  
Vol 54 ◽  
pp. 218-219
Author(s):  
H. S. Kim ◽  
R. U. Lee
Keyword(s):  
Stainless Steel ◽  
Filler Metal ◽  
Surface Preparation ◽  
Optical Microscope ◽  
Heating Element ◽  
Incomplete Fusion ◽  
Atmospheric Conditions ◽  
Leak Test ◽  
High Temperature Side ◽  
Inconel 600

A heating element/electrical conduit assembly used in the Orbiter Maneuvering System failed a leak test during a routine refurbishment inspection. The conduit, approximately 100 mm in length and 12 mm in diameter, was fabricated from two tubes and braze-joined with a sleeve. The tube on the high temperature side (heating element side) and the sleeve were made of Inconel 600 and the other tube was stainless steel (SS) 316. For the filler metal, a Ni-Cr-B brazing alloy per AWS BNi-2, was used. A Helium leak test spotted the leak located at the joint between the sleeve and SS 316 tubing. This joint was dissected, mounted in a plastic mold, polished, and examined with an optical microscope. Debonding of the brazed surfaces was noticed, more pronounced toward the sleeve end which was exposed to uncontrolled atmospheric conditions intermittently. Initially, lack of wetting was suspected, presumably caused by inadequate surface preparation or incomplete fusion of the filler metal. However, this postulation was later discarded based upon the following observations: (1) The angle of wetting between the fillet and tube was small, an indication of adequate wetting, (2) the fillet did not exhibit a globular microstructure which would be an indication of insufficient melting of the filler metal, and (3) debonding was intermittent toward the midsection of the sleeve.

Concealment and Exposure of PV Modules Failures with Temperature Change

2019 ◽  
Vol 139 (9) ◽  
pp. 584-591
Author(s):  
Takumi Takashima ◽  
Kazuaki Ikeda
Keyword(s):  
Temperature Change ◽  
Pv Modules

OPTIMAL DESIGN OF HEATING ELEMENT TO ENHANCE THERMAL PERFORMANCE IN GAS-GAS HEATER

2017 ◽  
Author(s):  
Young Mun Lee ◽  
Heeyoon Chung ◽  
Seon Ho Kim ◽  
Hyeng Seob Bae ◽  
Hyung-Hee Cho
Keyword(s):  
Optimal Design ◽  
Thermal Performance ◽  
Heating Element

Stress state analysis of two-way tunnel lining at different stages of soil defrostation

2019 ◽  
Vol 10 ◽  
pp. 160-171
Author(s):  
M.S. Pleshko ◽  
◽  
M.V. Pleshko ◽  
I.V. Voynov ◽  
A.V. Kostyukhov ◽  
...  
Keyword(s):  
Stress State ◽  
Tunnel Lining ◽  
State Analysis

NIKROTHAL TE

Alloy Digest ◽  
2013 ◽  
Vol 62 (10) ◽  
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Tensile Properties ◽  
Turn Of The Century ◽  
Heating Element ◽  
Attractive Alternative ◽  
Electric Resistance ◽  
Household Appliances ◽  
Nickel Chromium ◽  
Heating Technology

Abstract NIKROTHAL TE is a member of the Nikrothal family of alloys, which are one of two main types of electric-resistance alloys. Nickel-chromium (80Ni-20Cr, for example), developed around the turn of the century, was used as heating-element material in industrial furnaces and electric household appliances. Nikrothal alloys offer advantages in heating-element applications requiring very good mechanical properties in the hot state. This alloy is an attractive alternative to Nikrothal Alloys 40, 60, 70, and 80 (see Alloy Digest Ni-529, September 1997). This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming. Filing Code: Ni-710. Producer or source: Sandvik Heating Technology.

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