(1) The degree of engagement of the iron sheet joint. If the joint of the iron sheet is not firmly engaged, it will cause powder leakage or air oxidation of the core wire during bending, packaging, or uncoiling and straightening.
(2) Shell surface defects. The coated iron sheet is usually a low-carbon thin strip steel with a thickness of 0.2-0.4mm, which is prone to scratches or rust during production or storage and transportation, leading to oxidation of the core material.
(3) Uniformity of cross-sectional dimensions. Excessive error in the cross-sectional size of the core wire will cause significant load changes during the operation of the wire feeder, resulting in uneven feeding speed and affecting the addition effect.
