What types of welding methods are available for hot galvanizing units?
At present, in the continuous hot-dip galvanizing line of strip steel, narrow lap resistance welder is used.(1) lap seam welding is the simplest welding method. When welding, there is no molding and extrusion process, only the welding process.
(2) lap extrusion welding: in this welding mode, the first step is to pass the primary pressure when the welding wheel is not charged, and then the welding is conducted when the welding wheel returns.
(3) pre-lap extrusion welding:
First turn on the lap part of steel plate, in the absence of current, with a pair of high strength of extrusion wheel with extremely high pressure roll once, in order to reduce the thickness of the lap joint, and then pull has extrusion strip after some, and then in the melted zone, through the welding current welding together with tail and take the lead, the pressure of the last by extrusion wheel at a relatively low pressure die again once.