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If I heat up cracked glassware (wherein a crack has gone through part of the glass without any glass splitting away) will it cleanly refuse together before the whole piece loses its shape?

If so, would I just have to re-anneal it afterwards and that's it?

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    $\begingroup$ If you heat the entire parts of a glass apparatus, obviously the softening takes place first, and the parts will inevitably loose their shape. And to achieve a good joint, one should heat the glass above the melting point. As a result, you want to a. apply heat locally; b use a tool or a template to preserve the shape; c release stress in the glass by keeping the fixed apparatus in an oven for several hours/days. If you are at the university, find a glassblower who will likely be happy to add more details or to demonstrate how it's done. $\endgroup$ – andselisk Jul 12 '20 at 11:48

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