Zinc is a (word meaning female dog) to weld. No lie... it is toxic when you heat it to melting. I would suggest a cold-seal treatment.
Judging from your use of the language, I am guessing you are in the UK but if there are any standards that cross the Atlantic, try anything labeled as a 'Cold Seal' or as a last resort, use aluminum hydroxide colinate.
Edit: Two points:
A: I am a certified welder since 1991
B: Zinc is a pain in the butt
Good luck
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