Three inspection methods
weight
High quality welding wire is usually within the specified weight range. Such as: common plastic insulated single-stranded copper core wire, cross-sectional area 1.5, per1200m weight1.8-1.9kg; 2.5 plastic insulated single copper core wire, with a weight of 2.8-3.0kg; per 100m; 4.0 Plastic insulated single copper core wire, with a weight of 4. 100m/-4.2kg.. The wires with poor quality have insufficient weight or length, or the copper core of the wires has too many impurities.
copper
Qualified copper core wire copper core should be purple, shiny and soft to the touch.
factory
Fake and shoddy wires are often "three no products", but there are also vague labels on them, such as those made in China and some provinces and cities in China. In fact, it is equivalent to unmarked origin.
price
Because of the low production cost of fake and shoddy wires, vendors often sell them at low prices under the guise of good quality and low price, which makes people fall for it.