I am not going to get laborious in detail but I will offer some advice phrased in questions.
What are you trying to achieve?
If you are trying to provide a mesh screen then use "expa mesh" as you did in the previous project.
If you are trying to recreate the original then remove the damaged material and buy a new sheet (unlikely anyone will supply small pieces unless they have a part sheet) and buy a resistance welder which will enable a spot weld.
Understand the terminology, a spot weld passes a current through both pieces to be joined and melts one into the other. A MIG adds material.
MIG is by definition colder than oxy acetylene.
Feel free to call me one night by arrangement, and I can answer more welding questions
regards
Robin
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