The present invention is directed to a process for joining tantalum clad steel structures. The process broadly comprises: a) providing a first tantalum clad section, said first tantalum clad section comprising a tantalum layer over a steel layer, with a bonding layer optionally therebetween, with a portion of said steel layer in an edge region not being covered by said tantalum layer or said bonding layer, b) providing a second tantalum clad section, said second tantalum clad section comprising a tantalum layer over a. steel layer, with a bonding layer optionally therebetween, with a portion of said steel layer in an edge region not being covered by said tantalum layer or said bonding layer, c) locating said steel edge regions adjacent each other, d) welding the steel edge regions together, e) cold spraying a tantalum powder onto the welded edge regions and over the tantalum layers adjacent said edge regions thereby joining the tantalum clad steel sections. The invention is also directed to tantalum welds or joints formed by cold spraying tantalum powder.