ARC WELDER AND ARC WELDING METHOD

• Main Authors: FUJIYAMA NAOTO, KOJIMA KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 25.11.2021
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

To provide a technique that can use a multi-electrode submerged arc welder for welding a thick plate and can perform gas-shield arc-welding without using a flux, without substantially changing a welding condition that is used in the multi-electrode submerged arc-welding.SOLUTION: An arc welder, which arc-welds a thick steel plate whose thickness is 10 mm or more using a plurality of electrode wires, has a passage for shield gas provided between the electrode wires and a nozzle and means for cooling the nozzle, and further comprises a plurality of torches for arc-welding which delivers the electrode wire whose diameter is 3.2-4.0 mm closest to a weld progressing direction of the plurality of electrode wires and the other electrode wires whose diameters are 3.2-6.4 mm, in which the torch closest to the weld-progressing direction is inclined, at 0<θ<30°, from a direction perpendicular to the steel plate toward the weld-progressing direction and electrode currents can be set to 500 A or higher, where the maximum control current is 600 A or more and the maximum control voltage is 50 V or more. The arc welder is used in performing arc-welding.SELECTED DRAWING: Figure 1 【課題】厚板溶接用の多電極サブマージアーク溶接機が使用でき、かつ、多電極サブマージアーク溶接で用いる溶接条件を大きく変更することなく、フラックスを用いないで、ガスシールドアーク溶接できる技術を提供する。【解決手段】厚みが１０ｍｍ以上の厚鋼板を、複数の電極ワイヤを用いてアーク溶接するためのアーク溶接機であって、前記電極とノズルとの間に設けられたシールドガスの通路と、前記ノズルを冷却する手段を有し、複数の電極ワイヤのうち最も溶接方向進行側の電極ワイヤは直径３．２〜４．０ｍｍの電極ワイヤを、他の電極ワイヤは直径３．２〜６．４ｍｍの電極ワイヤを送出し、最も溶接進行側にあるトーチが鋼板に垂直な向きから溶接進行方向に０＜θ＜３０°傾いており、電極電流を５００Ａ以上とすることができることを特徴とするアーク溶接用トーチを複数備え、最大制御電流が６００Ａ以上、最大制御電圧が５０Ｖ以上であることを特徴とするアーク溶接機を用いてアーク溶接を行う。【選択図】図１