BS EN ISO 18595:2007 pdf free.Resistance welding — Spot welding of aluminium and aluminium alloys — Weldability, welding and testing.
This International Standard specifies requirements for resistance spot welding in the fabrication of assemblies of aluminium sheet, extrusions (both work- and age-hardening alloys) and/or cast material comprising two or three thicknesses of metal, where the maximum single (sheet) thickness of components to be welded is within the range 0,6 mm to 6 mm.
This International Standard is applicable to the welding of sheets or plates of dissimilar thickness where the thickness ratio is less than or equal to 3:1. It applies to the welding of three thicknesses where the total thickness is less than or equal to 9 mm.
Information on appropriate welding equipment is given in Annex A and on spot welding conditions in Annex B. The latter are for guidance only and may require modification depending on service conditions of the fabrication, type of welding equipment, characteristics of the secondary circuit, electrode material and geometry.
The welding of coated material, e.g. zinc-coated or anodised material, is not within the scope of this International Standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 669:2000, Resistance welding — Resistance welding equipment — Mechanical and electrical requirements
ISO 5182, Welding — Materials for resistance welding electrodes and ancillary equipment
ISO 5184, Straight resistance spot welding electrodes
ISO 5821, Resistance spot welding electrode caps
ISO 5830, Resistance spot welding — Male electrode caps
ISO 10447, Resistance welding — Peel and chisel testing of resistance spot and projection welds
ISO 14329:2003, Resistance welding — Destructive tests of welds — Failure types and geometric measurements for resistance spot, seam, and projection welds
ISO 15614-12, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 12: Spot, seam and projection welding
5 Material
5.1 Form
The material shall be flat rolled, extruded or cast and shall be free from harmful imperfections.
5.2 Types of aluminium alloys
A partial list of aluminium alloys is given in Annex C.
6 Surface conditions
Prior to welding, all surfaces shall be checked for their suitability for spot welding. The surfaces should be free from oil, grease, lubricant, visible oxidation, paint, dirt, or excessive scratches. If necessary, appropriate surface treatment, e.g. chemical etching, shall be carried out. Mill-finish surfaces are generally not suitable for spot welding; however, aluminium manufacturers can supply surface-treated material suitable for spot welding, e.g. with TiZr conversion coating. Extrusions shall also be in the mill-finish condition and will generally require pre-treatment. Die-cast material shall be free from excessive surface roughness and imperfections, e.g. as caused by washing out of the die material. Excessive quantities of dissolved gases in die-cast material shall be avoided. In addition, coated material can be supplied with chromate or phosphate passivation. Phosphated aluminium may be used in certain applications. These materials can be spot welded, although adjustment to the welding parameters will generally be necessary as outlined in Annex B.