Seam welders are use to conduct seam welding by conjoining of work pieces made of similar or dissimilar materials along a continuous seam. Seam welding can be broken down into two main techniques. One is resistance seam welding and the other the friction seam welding. Welding is a fabrication process that joins materials, usually metals or thermoplastics, with the utilization of high heat to melt the parts together and then allow them to cool down so that it would cause fusion. Seam welding is a type of electric resistance welding process, which can be classified by the different geometric types of the weld. Spot welding, seam welding, flash welding, and projection welding are all belonging to electric resistance welding.
Resistance seam welding machine is a welder by which the welding process produces a weld at the connecting surfaces of two similar metals. During the process, the seam may be a butt joint and such process is an automated process. It is different from flash welding in that flash welding welds the entire joint at once, rendering the results, yet seam welding forms the weld progressively and starts at one end.
Welding is distinct from lower temperature metal-joining techniques such as soldering and brazing. Seam welding works by its reliance of two electrodes. The two electrodes are often made from copper, so that they can apply to pressure and current with good results. The electrodes are usually disc-shaped objects, and they rotate as the materials passes through them. This manipulation allows the electrodes to stay in constant contact with the materials in order to make much longer and continuous welds. The electrodes could also move or assist the movements of the materials, achieving the intended welding results. In addition to melting the base metal, a filler material is typically added to the joint to form a pool of molten material. These materials will later cools down to form a joint. The joint is based on weld configuration. It can be stronger than the base material.
During the seam welding process, a transformer provides energy to the weld joint in the form of low voltage with high current AC power. The joints of the work pieces are with high electrical resistance value. The value is relative to the rest of the circuit and it is later heated to its melting point temperature by the power of the current. The semi-molten surfaces are later pressed together by the welding pressure. The welding pressure creates a fusion bond, which causes a uniformly welded structure onto and inside the materials. Most seam welder models adopt water cooling methods through the parts such as electrode, transformer, and controller assemblies because of the heat generated.
In the seam welding inventory, there are two modes to achieve seam welding: one is intermittent, and the other is continuous welding. During the intermittent seam welding, the wheels would advance to the targeted position and stop to make each weld, and this process of welding continues till the desired length of the weld is achieved. On the contrary, during the continuous seam welding process, the wheels would continue rolling as each weld is made. Either way, seam welding is able to produce an extremely durable weld since the joint is forged because of the applied heat and the applied pressures. A well welded joint made by resistance welding method can be stronger than the material from which it is made. In the applied industrial sector, a common usage of seam welding is conducted during the manufacture of round shaped or rectangular shaped steel tubing.
Automatic seam welding machine is controlled by computer programs and it can conduct the welding procedures by the well settled orders. Onsite workers don’t need to do much manual operations in certain specific details and processes once if the seam welder is with computer controlling system. This programmed welding process is a more stable working process with less reliance of human power, so it reduces the cost of labor expenses. It is anticipated that with the automation to be advanced in the future by engineers, such model of welding process can be improved much more and gain more productivity and efficiency.
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