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This type of mesh is a square grid of uniformly placed wires, welded at all intersections, and meeting the requirements of ASTM A185 and A497 or other standards. [1] The sizes are specified by combining the spacing, in inches or mm, and the wire cross section area in hundredths of square inches or mm2.
Over the last 30 years rigid mesh fencing has become the system of choice for demarcation across the UK, Europe and Australiam, in construction, civil, utilities and temporary works. Welded wire mesh fences are used predominantly as high security barriers where visibility through the fence is necessary or desirable.
Welding - Electron and laser-beam welded joints - Guidance on quality level for imperfections - Part 2: Aluminium and its weldable alloys ISO 13920: Welding - General tolerances for welded constructions - Dimensions for lengths and angles - Shape and position ISO 14112: Gas welding equipment - Small kits for gas brazing and welding ISO 14175
The voltage needed for welding depends on the resistance of the material to be welded, the sheet thickness and desired size of the nugget. When welding a common combination like 1.0 + 1.0 mm sheet steel, the voltage between the electrodes is only about 1.5 V at the start of the weld but can fall as low as 1 V at the end of the weld.
A metal mesh may be woven, [2] knitted, welded, expanded, sintered, [3] photo-chemically etched or electroformed (screen filter) from steel or other metals. In clothing, mesh is loosely woven or knitted fabric that has many closely spaced holes. Knitted mesh is frequently used for modern sports jerseys and other clothing like hosiery and lingerie
Heavier fabric scrims, however, are too tightly woven to allow the same bonding. In this case, an adhesive is used to bond the exterior films to the base fabric. A good chemical bond is critical to both prevention of delamination and development of seam strengths. The seam is created when vinyl-coated fabrics are welded together.