Hybrid friction diffusion bonding of 316L stainless steel tube-to-tube sheet joints for coil-wound heat exchangers

2016 ◽  
Vol 30 (11) ◽  
pp. 4925-4930 ◽  
Author(s):  
Nils Haneklaus ◽  
Cristian Cionea ◽  
Rony Reuven ◽  
David Frazer ◽  
Peter Hosemann ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Diffusion Bonding ◽  
Heat Exchangers ◽  
316L Stainless Steel ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Tube Sheet

Root cause analysis for 316L stainless steel tube leakages

2014 ◽  
Vol 37 ◽  
pp. 53-63 ◽  
Author(s):  
S. Kaewkumsai ◽  
S. Auampan ◽  
K. Wongpinkaew ◽  
E. Viyanit
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Root Cause Analysis ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Cause Analysis ◽  
Root Cause

Determination of Optimum Parameters Effect on Kerf Width of 316L Stainless Steel Tube in Nd:YAG Laser Cutting

2005 ◽  
Vol 475-479 ◽  
pp. 277-280
Author(s):  
J.M. Ahn ◽  
H.Y. Kim ◽  
T.H. Kim
Keyword(s):  
Stainless Steel ◽  
Cooling Rate ◽  
Process Parameters ◽  
Laser Power ◽  
316L Stainless Steel ◽  
Scanning Speed ◽  
Steel Tube ◽  
Gas Pressure ◽  
Kerf Width ◽  
Stainless Steel Tube

The effects of following four factors, which are laser power, assist gas pressure, cooling rate and scanning speed on the quality characteristics of laser cut 316L stainless steel tubes have been studied. 24 full factorial design and central composite design were used to evaluate optimum condition of process parameters. Regression analysis was used to develop empirical models for the combined effects of the independent process parameters on laser cut quality. As the results, it was observed that laser power, assist gas pressure and scanning speeds did the major effects on kerf width. The smallest kerf width was obtained with the condition of low laser power, assist gas pressure, scanning speed and moderate cooling rate. Calculated regression model was kerf width = 64.47 + 0.91W + 1.25P + 0.41S + 0.41C2 - 0.45P2

scholarly journals Ni Interlayer to Improve Low-Pressure Diffusion Bonding of 316L SS Press Fit Tube-to-Tubesheet Joints for Coiled Tube Gas Heaters

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Rony Reuven ◽  
Alan Bolind ◽  
Nils Haneklaus ◽  
Cristian Cionea ◽  
Charalampos Andreades ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Diffusion Bonding ◽  
316L Stainless Steel ◽  
Low Pressure ◽  
Stainless Steel Tube ◽  
Coiled Tube ◽  
Tube Heat Exchanger ◽  
Press Fit ◽  
Pull Out ◽  
Ni Interlayer

This study suggests a new approach to diffusion bonding (DB) 316L stainless steel: a low-pressure procedure that includes a nickel interlayer. In this approach, relatively lower pressure is applied to the sample before the DB process, in contrast to the usual approach in which higher pressure is applied during the DB process. This new procedure was tested on mock-up 316L stainless steel tube-to-tubesheet joints, which simulated similar joints in coiled-tube heat-exchanger applications. This study confirms that the new procedure meets the overall success criteria, namely, a pull-out force exceeding the force required for tube rupture. It also shows that the DB joint is improved by the use of a Ni interlayer; the joint strength increased by approximately 33% for a 0.25 μm Ni interlayer and by approximately 18% for a 5 μm Ni interlayer. The joint cross sections were qualitatively examined using optical microscopy (OM) and scanning electron microscopy (SEM); the observations suggest that only portions of the interface were diffusion bonded, as a result of the low-pressure procedure and the surface roughness (due to the sample fabrication). The portions that were diffusion bonded, though, were sound, as characterized by the fact that the steel grains grew through the interface line to create a continuous metallographic structure.

Microstructural evolution in the welding zone of laser shock peened 316L stainless steel tube

2017 ◽  
Vol 29 (1) ◽  
pp. 012007 ◽  
Author(s):  
J. Z. Lu ◽  
W. Q. Zhang ◽  
X. Jing ◽  
L. J. Wu ◽  
K. Y. Luo
Keyword(s):  
Stainless Steel ◽  
Microstructural Evolution ◽  
316L Stainless Steel ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Laser Shock ◽  
Welding Zone

316L Stainless Steel Diffusion Bonding Optimized Parameters

2017 ◽  
Author(s):  
Gustavo Nuernberg ◽  
Grégori Rosinski ◽  
Priscila Gonçalves ◽  
Marcus Mortean ◽  
Regis Henrique Goncalves e Silva ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Diffusion Bonding ◽  
316L Stainless Steel
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