Other information that may help:
1. All layer components within the sandwich structure are metallic in nature.
2. Structure configuration is pretty similar to Aluminum Foam Sandwich (AFS) structures.
3. Joint type: Butt joint with thickness >1 in.
Welding standards also depend on country, industry and other factors. You should start to find the answers in the next list:
ISO 10042:2018 Welding -- Arc-welded joints in aluminium and its alloys -- Quality levels for imperfections
ISO 6520-1, Welding and allied processes — Classification of geometric imperfections in metallic materials — Part 1: Fusion welding
AWS D1.2 Structural welding (aluminum)
AWS D8.14 Automotive arc welding (aluminum)
W47.2-11 (R2015) Certification of companies for fusion welding of aluminum
W59.2-M1991 (R2013) Welded Aluminum Construction
EN 1090-1 Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components
PD 6705-3 Structural use of steel and aluminium. Recommendations for the execution of aluminium structures to BS EN 1090-3
EN 1011-1 Welding — Recommendations for welding of metallic materials — Part 1: General guidance for arc welding
EN 1011-4 Welding — Recommendations for welding of metallic materials — Part 4: Arc welding of aluminium and aluminium alloys
I agree Mikhail Slobodyan, Welding standards depend on many factors , but you can see AWS standards.
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