Low Alloy Steel Covered Arc Welding Electrodes
This welding wire standard Requires low-alloy steel flux-covered electrode wires. For welding steel and low alloy steel with manual arc welding (SMAW) standards.
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1.1. Type of welding wire
Welding wires are classified according to the mechanical properties of the weld, the type of flux, the position of the weld, the type of welding current and the chemical composition of the weld.
1.2 Low alloy steel electric wire requirements For cover gas welding AWS A5.28-79 standard.
(Low Alloy Steel Filler Metals For Gas Shielded Arc Welding)
1. Type of welding wire
Bare filament and rod welding wire Classified by chemical composition and mechanical properties of the weld For Mig Welding (GMAW) processes, this wire can also be used for TIG and Plasma welding processes.
1.3 Flux cored wire standard for low alloy steel welding (AWS A5.29-80).
This standard stipulates that flux cored wire For welding carbon steel and low alloy steel
2. Type of welding wire
Classification of flux filament welding wire Based on the following components
(1) Is the CO gas cover used separately?
(2) type of welding current
(3) welding position
(4) The chemical composition of the weld
(5) Welded meat mechanical properties
1.4 Standard Bare Stainless Steel Welding Electrodes and Rods (AWS A5.9-93)
This standard requires stainless steel bare wire, flat bar, composite metal cored, electrodes and rods to contain less than 10.5% chromium and more iron than other balanced elements.
This type of welding wire Can be used for mig, tick, plasma and under-flux welding processes.
3. Classification of welding wires
Welding wires can be classified according to their chemical composition.
1.5 Standard instead of chromium steel flux filament welding wire. Corrosion and Chromium-Nickel Steel (AWS A 5.22-80)
This standard requires that the wire contains at least 5% of the non-metallic composition for the flux filament and that the wire contains more than 4.0% chromium and 50.0% nickel.
4. Classification of welding wires
The classification of welding electrodes depends on the chemical composition of the weld and the cover gas during welding.
1.6 Stainless steel flux-clad steel wire specification For manual arc welding (SMAW) processes AWS A 5.4 – 92
(Stainless Steel Electrodes for Shielded Metal Arc Welding)
This standard describes the requirements for stainless steel flux-cored wires. for SMAW welding
The weld content contains not less than 10.5% chromium and a higher content of alloyed steel than other elements.
5. Type of welding wire
Classification of welding wires according to this standard can be divided as follows
1) Classified according to the chemical composition of the weld
2) Divided by type of welding current and welding position
2.Type and use of welding wire
There are five types of flux-clad stainless steel electrodes. The type of flux-clad determines the properties of the wire to be used. which is designated by the last two number symbols of the welding wire symbol. The details are as follows.
EXXX – 15 This electrode is used for deep current (positive electrode) only, alternating current is not recommended for quality welding. Welding wire size not larger than 5/32 inches (4.0 mm.) can be used for all welding positions.
EXXX – 16 This type of welding wire. Contains an ionizing element, such as potassium, to provide a uniform arc for alternating current welding electrodes up to 5/32 in. (4.0 m) m) can be used to weld in all welding positions
EXXX – 17 This type of welding electrode is an improvement from the flux-covered EXXX – 16 welding wire with the addition of silica instead of titanium to the -16 welding wire. Both of these wires can be used with alternating current. Previously, these two wires were divided into -16 only until the new standard (ANSI /AWS A5.4) was revised.
Welding wire – 17 is used to connect the filet seam level. Provides sprayed metal water transfer and the surface of the weld has finer scales than welded with wire – 16 welding wire-17 giving the filet weld a smooth, flat or concave shape. Welding wire section – 16 gives the filet weld shape. a smooth and slightly convex Upright filet welding requires a slight oscillation of the weld wire technique. For welding with electrode -17 due to slow cooling of slag. This type of welding wire is designed to be able to weld in every welding position. But if the welding wire is larger than 3/16 (4.8 mm.) welding is not recommended.
EXXX-25 This type of welding electrode has a slag -15 in terms of composition and properties. will differ in the texture of the wire rod in the ingredients For example, the core wire is mild steel, welding wire – 25 requires high welding current. Mixed elements are added to the cladding flux. In order to get the weld with the desired composition, therefore, welding wire -25 is larger than welding wire -15. It is recommended to weld only flat and level positions only.
EXXX-26 This type of welding wire has a slag similar to that of welding wire – 16 in terms of composition and properties. Will differ in the texture of the wire rod in the composition, for example, the wire core is mild steel, welding wire – 26 requires a high welding current. Mixed elements are added to the sheath flux to obtain the required elemental weld content. Therefore, -26 electrodes are larger than -16 electrodes, and it is recommended to weld only flat and level positions.