Shielded Metal Arc Welding (SMAW)

 

Electrode Selection: For ASTM A606 TYPE4 steel, electrodes suitable for low - alloy steel welding should be selected. The coating type and alloy composition of these electrodes need to match the chemical composition of the steel to ensure good welding quality. Generally, the content of alloy elements (such as copper, chromium, nickel, etc.) in the electrode should be close to that of the steel itself. This can provide similar corrosion resistance and mechanical properties during the welding process. For example, an electrode such as E7018 - A1 can be selected. It is suitable for welding low - alloy steel with a certain degree of corrosion resistance and can provide good weld strength and toughness.

 

Welding Parameters: The welding current should be determined according to the diameter of the electrode and the thickness of the welded part. Generally speaking, for an electrode with a diameter of 3.2 mm, the welding current can be set between 90 - 130 A; for an electrode with a diameter of 4.0 mm, the current range may be between 140 - 180 A. The welding speed is also crucial. An overly fast welding speed may lead to poor fusion of the weld, while a too - slow speed will cause the weld to overheat and affect the weld performance. Usually, the welding speed of shielded metal arc welding can be controlled at about 10 - 15 cm/min. During the welding process, attention should also be paid to the arc length. Short - arc welding should be maintained. Generally, the arc length should not exceed the diameter of the electrode. This can better protect the molten pool and reduce welding defects such as pores.

 

 

 

 

 

 

 

 

 

 

 

Products	Corten Steel Plate
Standard grade	ASTM: Corten A; Corten B; A588Gr.A/Gr.B/Gr.C/ Gr.K; A242; A606 Type 4;A709 Gr 50W;
	EN10025: S235J0W; S235J2W; S355J0W; S355J2W; S355K2W; S355J0WP; S355J2WP; S355J2G1W; S355J2G2W; S355K2G1W, S355K2G2W;
	JIS G3114: SMA400AW; SMA400BW; SMA400CW; SMA490AW; SMA490BW; SMA490CW; SMA570W; SMA570P;
	JIS G3125: SPA-H; SPA-C;
	GB/T 4171: Q235NH; Q265GNH; Q310GNH; Q295NH; Q295GNH; Q355NH;Q355GNH;Q415NH; Q460NH; 1500NH; Q550NH;
	TB/T 1979: 09CuPCrNi-A; 09CuCrNi-B; 05CuPCrNi;
	Q/BQB 340: B460NQR; B490NQR; B480GNQR; B600GNQR;
Thickness	Cold Rolled 0.5-2mm Hot Rolled 2-300mm (2-100mm usually used)
Width	1000-3000mm (1000-2200mm usually used)

 

 

Gas Metal Arc Welding (GMAW)

 

Shielding Gas Selection: In gas - shielded welding, the commonly used shielding gases are carbon dioxide (CO₂) or a mixture of argon (Ar) and carbon dioxide (such as Ar + 20% CO₂). For ASTM A606 TYPE4 steel, using a mixed gas can achieve better welding results. Argon can provide a stable arc and good droplet transfer, and carbon dioxide helps to enhance the oxidizability of the weld and improve the weld formation and quality. This mixed gas can effectively protect the molten pool, prevent oxygen and nitrogen in the air from entering the molten pool, and thus reduce welding defects such as pores and cracks.

 

Wire Selection and Parameter Setting: The selection of welding wire should consider the chemical composition and mechanical properties of the steel. Generally, a low - alloy steel welding wire with a composition similar to that of the base metal should be selected. For example, the ER70S - 6 welding wire is a commonly - used option. It contains an appropriate amount of alloy elements and can ensure good matching between the weld and the base metal. The setting of welding current and voltage is also crucial for welding quality. When using a welding wire with a diameter of 1.2 mm, the welding current can be between 180 - 250 A and the voltage between 22 - 28 V. The welding speed can be adjusted according to the actual situation, generally around 30 - 60 cm/min.

 

 

 

 

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