How to prevent the neat fracture of the welding seam of the packaging steel strip?

How to prevent the neat fracture of the welding seam of the packaging steel strip?
　　The ways to prevent such accidents are:
　　 (1) Strictly control the thickness difference when welding thin steel strips, including the Indian difference when the specifications change, and the difference caused by the insufficient amount of shearing scrap when the steel strip is too thick at the head and tail. The influence of the latter may be greater .
　　 (2) In the case of ensuring the penetration of the weld, appropriately reduce the welding current and reduce the degree of overheating of the substrate near the weld.
　　 (3) For the normal production of thin plates, the welding process can be adjusted from continuous seam welding to intermittent seam welding. In this way, the unheated part formed by the intermittent discharge will not have a hardened structure, but will transform into an annealed structure with better plasticity than the chilled plate, and will not form a continuous hardened line near the weld, and will not be in the production line. It breaks neatly when running on top.
　　 For the normal production of ultra-thin galvanized wire with ultra-thin specifications below 0.23mm, it is best to use a welding machine with tempered wheels, which is characterized by a tempered wheel behind the welding wheel, which can make the welding seam and welding The structure near the joint is heated again to above the tempering temperature (about 720°C), and the structure returns to the austenite state. At this time, the temperature of the surrounding matrix is u200bu200balready higher when it is cooled again, the temperature gradient decreases, and the cooling speed becomes slower. It will transform austenite into tempered structure, no quenched structure, and the flatness of the weld can be corrected, and the phenomenon of band breakage at the weld can be better prevented.