Influence of the Cross-sectional Area of Consumable Nozzle on Welding Phenomena in Electrosalg Welding

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI:10.2207/qjjws1943.50.373

S. Nakata, Nobuharu Sakabata, Minoru Mouko

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Abstract

Influence of the cross-sectional area of consumable nozzle on the penetration in base plate and its stability and the possibility on the control of welding phenomena by changing the nozzle current is investigated using the mild steel plate with the thickness of 30 mm to develop narrow gap electroslag welding process with high efficiency and low heat input.It is experimentaly shown that the nozzle with large crosssectional area is useful in stable and high current welding process because of dispersing the welding current in slag pool by increasing the nozzle current. So, the method for estimating the nozzle current during welding is designed and, by this method, the nozzle current is estimated under various conditions in connection with the cross-sectional area of the nozzle.Adopting above results to high current narrow gap welding process, it is clarified that more stable and uniform penetration can be obtained by using the nozzle with large cross-sectional area. This result is due to the preheating effect at root faces of base plate in slag pool and dispersing the heat source in slag pool by increase of nozzle current.

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电液焊中焊嘴截面积对焊接现象的影响

采用30 mm厚的低碳钢板，研究了耗材喷嘴截面积对基板熔透及其稳定性的影响，以及通过改变喷嘴电流控制焊接现象的可能性，开发了高效低热输入的窄间隙电渣焊工艺。实验表明，大截面积喷嘴可以通过增大喷嘴电流分散熔渣池中的焊接电流，有利于稳定大电流焊接。因此，设计了焊接过程中喷嘴电流的估算方法，并利用该方法估算了与喷嘴截面积有关的各种条件下的喷嘴电流。将上述结果应用于大电流窄间隙焊接工艺，说明采用大截面积喷嘴可以获得更稳定、均匀的焊透。这是由于渣池底板根部表面的预热作用和喷嘴电流的增大使渣池热源分散的结果。

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Transactions of the Japan Welding Society

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