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Technical Brief

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

[+] Author and Article Information
R. Reuven

N.R.C.N P.O. Box 9001, Beer-Sheva, Israel
rony.reuven@gmail.com

A. M. Bolind

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
bolind@berkeley.edu

N. Haneklaus

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
nils.haneklaus@rwth-aachen.de

C. Cionea

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
cionea@yahoo.com

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
charalampos@berkeley.edu

G. Buster

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
gbuster@nuscalepower.com

P. Hosemann

Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
peterh@berkeley.edu

P. F. Peterson

ASME Membership Department of Nuclear Engineering, University of California, Berkeley; 4118 Etcheverry Hall, MC 1730, Berkeley, CA 94720-1730
peterson@nuc.berkeley.edu

1Corresponding author.

ASME doi:10.1115/1.4035725 History: Received July 28, 2016; Revised January 08, 2017

## Abstract

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 and scanning electron microscopy; 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.

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