This Japanese industry standard is set to steel welding wire Hereinafter referred to as “welding wire” used for under-flux welding. For welding carbon steel and low alloy steel (high tensile stress steels, heat resistant steels, low temperature steels and corrosion resistant atmospheric steels)
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1. Type of welding wire
Welding wires can be classified according to their chemical composition.
Flux Standards for Carbon and Low Alloy Steels in Welding Fluxes ( JIS Z 3352 -1988 )
Japanese Industrial Standard Determine the flux used for welding under the flux. For welding carbon steel and low alloy steel (high tensile stress steels, heat resistant steels, low temperature steels, and corrosion resistant atmospheric steels)
2. Type of flux
Fluxes can be classified according to their type and chemical composition.
- Flux symbol
- Quality of flux
The flux must be of the following qualities:
(1) Must be of consistent quality can be fed to the area regularly and provide beautiful welds and
good weld shape
(2) Flux will not change simple ingredients. And it must not absorb moisture easily as well.
Electrical Welding Wire and Rod Filling Wire Requirements For welding cast iron, AWS A5.15-90 standard.
(Specification for Welding Electrodes and Rods for Cast Iron)
This welding wire standard The welding wires can be divided as follows:
(1) Rods for gas welding
(2) Electrodes for mig welding (GMAW)
(3) Electrodes for flux cored welding.
(4) Electrodes for manual arc welding (SMAW)
Such wires are suitable for welding gray cast iron, ductile cast iron, nodular graphite cast iron and alloy cast iron.
3. Type of welding wire
Electrodes and Rods are classified according to their chemical composition.
The division of welding wires can be used for gas welding, GMAW welding, Flux Cored Wire welding and SMAW welding for other welding processes. is not suitable for welding cast iron
2.Details and use of electric welding wire and filling wire for cast iron
Next, we will discuss how to use Electrodes and Rods to be suitable for each type of cast iron. The guidelines provide a general guideline. Therefore, to achieve good results depends on the welder’s experience. and information from the manufacturer’s manual
Rods are for gas welding processes only and Electrodes are intended for SMAW , GMAW and FCAW welding processes.
2.1 Cast iron filling wire
RCI (Cast Iron)
Gray cast iron commonly used to make machinery. It has a tensile strength of 20-40 ksi (140-280 MPa) and a hardness of 150-250 BHN. Gray cast iron wires can be welded to such machines by gas welding processes. The color of the weld, the chemical composition and the structure are the same as the work metal. Welding, if done properly, welds will have the same strength as the work metal as well.
RCI wires are used for filling or adding new filets. Replace the wear of cast iron, welding new work and repair work.
RCI-A (Cast Iron)
This cast iron welding wire contains a small amount of modilinum and nickel. Will have a melting point slightly higher than ordinary cast iron wire. RCI welding wire metal water flows well, welding can be done faster.
RCI-A welding wire, with a hardness of approximately 230 Brinell, may be used for welding alloyed cast iron. and high tensile stress and require fine structure Welded meat can be decorated with machines.
RCI-B (Nodular Cast Iron)
Ductile Iron Welding Wire It produces good welds when welding high strength gray cast iron, ductile cast iron and nodular graphite cast iron. with gas welding process under optimal welding conditions The weld body has a minimum tensile stress of 60,000 Psi (410 MPa). The weld has a minimum stress of 45,000 Psi (310 MPa), a percentage of elongation of 5-15%, and a maximum hardness of 200 Brinell. These mechanical properties are due to the spherical graphite forming of the weld. This results in good results in toughness, machine finishing ability, and the color of the weld is compatible with the color of the metal.
2.3 ESt(Steel) wire for welding cast iron with SMAW
This type of flux covered wire is designed to be able to weld cast iron at any welding position. which has a low melting point unlike carbon steel wires The resulting welds cannot be manipulated by machines.
Welding may not prevent solid areas or weld layers. Because the welding wire is melted into the work metal. This type of welding wire is therefore limited to use only for small repair work. and do not want to decorate with machines after welding. Steel will shrink more than cast iron. Therefore, welding will experience high stress when cooled. and if residual stress is high enough, it may cause cracking.
Pre-heating can reduce residual stresses in the casting parts. Est welding wires are welded with low current and low annealing between the wires and working loads. Deep current or AC welding is used for short welds and light peening. other