Recent advances in Ti and Nb explosion welding with stainless steel for 2K operating (ILC Program)- To the proceedings of LCWS11

TL;DR

This paper reports on the successful manufacturing and testing of Ti+SS and Nb+SS explosion-welded joints with high mechanical strength, low leak rates, and stress relaxation through thermal tempering, relevant for 2K operation in the ILC program.

Contribution

It presents new explosion welding techniques for Ti and Nb with stainless steel, demonstrating high-quality joints suitable for cryogenic applications.

Findings

High mechanical properties and leak-tightness at 4.6 x 10^{-9} atm-cc/sec.

Residual stresses around 1000 MPa measured by neutron diffraction.

Thermal tempering relaxes internal stresses, improving serviceability.

Abstract

The world first samples 0f Ti+SS and Nb+SS joints were manufactured by an explosion welding technology demonstrating a high mechanic properties and leak absence at 4.6 x 10^{-9} atm-cc/sec. Residual stresses in bimetallic joints resulting from explosion welding measured by neutron diffraction method are quite high (~1000 MPa). Thermal tempering of explosion welded Ti+SS and Nb+SS specimens leads to complete relaxation of internal stresses in Ti,Nb and Stainless steel and makes the transition elements quite serviceable.