中文
Long-distance pipeline welding electrode use of position to the Welding Electrode and the traditional low-hydrogen electrodes, the implementation of standards GB / T 5117-1995, GB / T 5118-1995, the AWS A5.1-91 and AWS the A5 .5-96 and so on. All-position welding electrode is divided into two categories: one is a high-fiber (based on pipeline steel C, S, low P content, consider using), this electrode welding performance, less slag. and the blowing force to prevent the slag and molten iron under the drip, and a greater penetration capability and faster deposition rates at various location of one-side welding, molding effect is good, suitable for root welding and heat production welding, representative, such as Austria horses BOHLER the FOX CEL (AWS A5.1-91 E6010) and BOHLER the FOX the CEL 85 (production of the AWS A5.5-96 E8010-P1) electrode, the United States Lincoln FLEETWELD 5P + ( AWS A5.1-91 E6010) and the SHIELD the ARC 70 + (AWS A5.5-96 E8010-G) electrode, China Shipbuilding Heavy Industries 7 25 the developed SRE425G (AWS A5.1-91 E6010), SRE505 (AWS A5. 5-96 E7010-G) and SRE555 (AWS A5.5-96 E8010-G) electrode. The other is iron powder low hydrogen type electrode, the electrode solidification speed, hot metal mobility and invasive, all-position welding difficult drip, after Welding Wire, the weld metal toughness and crack resistance, suitable for layers next to the welding, production representative, such as Austria horses BOHLER FOX the BVD 85 (AWS A5.5-96 E8018-G) electrode, the United States Lincoln LINCOLN of LH, the D80 (AWS A5.5-96 E8018 -G) electrode. Low hydrogen type electrode because of its all-position to the root welding process performance in general, arc difficulties, poor arc stability, spatter a larger difference between the back of the molding, easy to vent, it is generally no longer used, are generally used for dimensional repair and rework welding filler capping, representative of production such as Sichuan Atlantic CHE507GX (GB / T 5118-1995 E5015), CHE557GX (GB / T 5118-1995 E5515). The commonly used high-cellulose electrode specifications generally Φ3.2mm, Φ4.0mm, iron powder low hydrogen type electrode specifications generally Φ4.0mm ordinary low hydrogen type electrode specifications generally Φ3.2mm.In general, σ0.5 (0.2) ≤ 415MPa oil, water conveyance pipelines welding can choose a high cellulose type electrode layers welding; gas pipeline or σ0.5> 415Mpa pipeline trunk welding can be high cellulose type electrode, welding, heat welding + low hydrogen type electrode filling, cover the surface of the composite process.
(1) pure nickel class cast iron electrode. Electrode made of pure nickel weld core and graphite-type coating, weld nickel-containing more than 90%, mainly for difficult welding Welding malleable cast iron and alloy cast iron.(2) nickel-iron type cast iron electrode: the electrode made by the core of nickel-iron Welding Electrode and graphite type coating, containing nickel in the weld in about 50% of soil to be used for repair welding of ductile iron.
(3) of nickel and copper in class cast iron electrode. Nickel-containing welding nickel-copper alloy (monel) core and the electrode made of graphite-type drug skin, the weld 60% to 70%, copper 25% and 35% for repair welding of gray cast iron.
(4) cast iron cast iron electrode. Cast iron welding core electrode made of carbon steel welded core and graphite type coating, weld composition of cast iron composition is close to gray cast iron and nodular cast iron welding repair welding should preheat to 400 ~ 500 ℃ , slow cooling after welding insulation.
Manual arc welding, repair welding cast iron piece with the electrode. According to weld 928 points, there are mainly five types of electrode:
(1) pure nickel class cast iron electrode. Electrode made of pure nickel weld core and graphite-type coating, weld nickel-containing more than 90%, mainly for difficult welding Welding malleable cast iron and alloy cast iron.
(2) nickel-iron type cast iron electrode: the electrode made by the core of nickel-iron Welding Wire and graphite type coating, containing nickel in the weld in about 50% of soil to be used for repair welding of ductile iron.
(3) of nickel and copper in class cast iron electrode. Nickel-containing welding nickel-copper alloy (monel) core and the electrode made of graphite-type drug skin, the weld 60% to 70%, copper 25% and 35% for repair welding of gray cast iron.
(4) cast iron cast iron electrode. Cast iron welding core electrode made of carbon steel welded core and graphite type coating, weld composition of cast iron composition is close to gray cast iron and nodular cast iron welding repair welding should preheat to 400 ~ 500 ℃ , slow cooling after welding insulation.
