Radiator Support minor repair - Maintenance/Repairs - Car Talk

I have a damaged radiator support on an 2013 Audi TT. The broken piece is not structual and does not interfere with the proper support of the radiator. However I do have a broken piece that I would like to put back in place. The support is plastic but I do not know the material so that I can choose the best welding solvent. Does anyone know what this is made from (ABS, PVS, PP, etc)?

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Just got car back from mechanic. WTF is this on my radiator? : r/MechanicAdvice