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Here the problem is that both are inflexible and impervious.
Any temperature change will result in expansion or contraction of the metal parts and this most likely will be different to the glue resulting is stress in the joint and possible failure.
Note that most glues do not like high temperatures and so look carefully at the specifications if you want the glue to work above abient temperature.
Surface preparation is really important. Here I have roughed the surface with emery cloth and then scratched the surface with a knife. A blob of glue was placed in the centre of one surface and then the 2 parts pushed together.
This approach maximises the surface area and gives the best possible surface for the glue to adhere to.
This is an amazing glue and is able to bond metal to metal.
Review - Gorilla Glue - according to the information this will glue: stone, metal, ceramics, glass, wood, foam and more....
Instant glue will form a bond between the two surfaces if they are both clean, free from grease and if the metal will not get too hot. Above 100°C most instant glues start to break down and fail.
This is not exhaustive and so please do email me if you have a question or even better an answer.