Why should we weld from top to bottom when welding with bar welding?
Wipe, when did you go on the job as a welder?
Reinforced lap welding the weld bead can maintain high strength, after the completion of requirements of weld full, without inclusions or non fusion defects such as welding method generally depends on the position of welding joint, when the flat from left to right or right to left does not matter, as long as we can guarantee the quality.You said from the bottom up welding, welding joint may be placed perpendicular to the direction perpendicular to the ground, when the weld shall be in accordance with the welding operation to welding, because the weld pool and perpendicular to the ground electrode melting molten iron will be under its own gravity falling down, if down from welding that will cover the molten metal in the weld front (i.e., the hot metal lead) base material is not directly heated and melted arc, resulting in incomplete fusion, incomplete welding defects
1, welding rod welding lap when welding from bottom to top welding is because if it is from the top to the welding, that is, backward welding, light good-looking, no strength, welding pool is very shallow.2, the electrode (covered electrode) welding or welding filler metal in melting joint welding of the workpiece. The electrode material is usually the same as the material of the workpiece.3, the overlap is in the concrete structure component, when the steel bar length is not enough, according to certain request, two steel bars overlap each other and form the connection. The basic forms of reinforcing bar connections are banding, lapping, welding and mechanical connection. Two different types of materials such as steel plate is called the coincidence of the lap, lap, available fixed rivets or bolts; wooden lap, nail available; steel lap, tighten the buckle card available; wood lap, use wire winding stiffening, reinforcement lap, reinforced by a certain length of overlap lashing, concrete grip of the two bars the synchronous force.
