Fabrication Inspection

Fabrication
Fabrication is usually made by making thin metal sheets plastic and deformed by hand or by stamping on a die to get the desired shape and size, and then by welding or a small amount of machining to make up more complex parts.

Ⅰ Welding:

REFERENCED DOCUMENTS
AS/NZS 1664.1:1997 : Australian/New Zealand Standard Aluminium structures.

Ⅱ Cutting:

Cutting shall be as follows:
a. Material shall be sheared, sawed, cut with a router, or arc cut, All edges which have been cut by the process shall be planed to remove edge cracks.
b. Cut edges shall be true and smooth, and free from excessive burrs or ragged breaks.
c. Re-entrant cuts shall be avoided wherever possible. If used, they shall be filleted by drilling prior to cutting.
d. Oxygen cutting shall not be used on aluminium alloys.

Ⅲ Drilling:

The following rules for punching, drilling, and reaming shall be observed:
a. Rivet or bolt holes shall be either punched or drilled. Punching shall not be used if the metal thickness is greater than the diameter of the hole. The amount by which the diameter of a sub-punched hole is less than that of the finished hole shall be at least 1/4 the thickness of the piece and in no case less than 0.8 mm.
b. The finished diameter of holes for cold-driven rivets shall be not more than 4 percent greater than the nominal diameter of the rivet.
c. The finished diameter of holes for hot-driven rivets shall be not more than 7 percent greater than the nominal diameter of the rivet.
d. The finished diameter of holes for bolts shall be not more than 1.6 mm larger than the nominal bolt diameter.
e. If any holes must be enlarged to admit the rivets or bolts, they shall be reamed. Poor matching of holes shall be cause for rejection. Holes shall not be drilled in such a manner as to distort the metal. All chips lodged between contacting surfaces shall be removed before assembly.

Ⅳ Packing:

a. Prior to field painting of structures, all surfaces to be painted shall be cleaned immediately before painting, by a method that will remove all dirt, oil, grease, chips, and other foreign substances.
b. Exposed metal surfaces shall be with a suitable chemical cleaner such as a solution of phosphoric acid and organic solvents. Abrasion-blasting shall not be used on aluminium less than or equal to 3 mm thick.

Ⅴ Workshop:

a. All the welders in the workshop hold welders' certificates.
b. All Livart’s products have passed ISO9001:2015, ISO14001:2015, BS OHSAS18001: 2007.