Soldering flux containing a temperature sensitive chemically reactive colorant

摘要: A heat-recoverable soldering device comprises a member having fusible solder insert and associated with the insert, flux composition which undergoes visible color change at critical temperature. Solderable substrates are positioned within heated until temperature has been reached as indicated by in flux. The depends on material of particular used. It is that required to effect joint between recovery member. Novel compositions their use also disclosed.