JIS Z 3140:2017规定了薄板厚度不小于0.4 mm且不大于5.0 mm的低碳钢、低合金钢、高强度钢、不锈钢、铝和铝合金材料的电阻点焊（以下简称焊缝）的等级、检查方法和验收标准。本标准适用于表面处理材料。此外，本标准仅适用于形成熔核的电阻点焊。

JIS Z 3140:2017 specifies the grades, inspection method and acceptance criteria for resistance spot welds (hereafter referred to as welds) of mild steel, low alloy steel, high strength steel, stainless steel, aluminium and aluminium alloy materials with a sheet thickness not less than 0.4 mm and not greater than 5.0 mm. This Standard is applicable to surface-treated materials.Further, this Standard is only applicable to resistance spot welding which forms nuggets.