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Shielded Metal Arc Welding (SMAW)
Characteristics and Speed Requirements: Shielded metal arc welding has high operational flexibility, but the welding speed is relatively slow. This is because it relies on manual operation of the welding electrode to complete the welding process, and welders need to control multiple factors such as the angle of the electrode, the length of the arc, and the feeding speed. Generally speaking, the welding speed of shielded metal arc welding is around 8 - 15 cm/min. For example, when welding hot - rolled steel plates with a thickness of 6 - 10 mm, the welding speed may be maintained at 10 - 12 cm/min to ensure the quality of the weld.

Factors Affecting Speed: The welding speed is affected by factors such as the position of the weld, the thickness of the steel plate, and the diameter of the electrode. In the flat welding position, the welding speed can be a bit faster; while in vertical welding, overhead welding and other positions, in order to prevent the molten pool metal from flowing, the welding speed will be appropriately slowed down. For thicker steel plates, the welding speed is usually slower because sufficient heat is needed to ensure that the root of the weld is fully penetrated. The diameter of the electrode also affects the welding speed. Thicker electrodes require more heat to melt, so the welding speed will be correspondingly reduced.

Factors Affecting Speed: The welding speed of gas shielded welding is mainly affected by factors such as welding current, voltage, wire diameter, and shielding gas flow rate. On the premise of ensuring the quality of the weld, as the welding current and voltage increase, the welding speed can be appropriately increased. The wire diameter also has an impact on the welding speed. Generally, thinner wires allow for higher welding speeds. When the shielding gas flow rate is appropriate, it can ensure the stability of the welding process and is conducive to increasing the welding speed; if the flow rate is improper, it may affect the stability of the arc and the quality of the weld, thus requiring a reduction in the welding speed.

Submerged Arc Welding
Characteristics and Speed Requirements: Submerged arc welding is an efficient automatic welding method with a relatively fast welding speed. It uses granular flux to cover the welding area, and the arc burns under the flux layer, which can provide a large welding current and has a deep penetration. The welding speed of submerged arc welding can reach 30 - 100 cm/min. For example, when welding thick plate structures (such as the hulls of large ships), the welding speed can be adjusted between 40 - 80 cm/min according to the thickness of the steel plate and the requirements of the weld, enabling a large amount of welding work to be completed quickly.

Factors Affecting Speed: The welding speed of submerged arc welding mainly depends on factors such as welding current, arc voltage, wire diameter, and flux type. A larger welding current and an appropriate arc voltage can increase the welding speed. The wire diameter is also related to the welding speed. Thick wires can achieve higher welding speeds under high currents. The performance of the flux will affect the stability of the welding process and the quality of the weld. High - quality flux helps to ensure the welding quality at higher speeds.

Laser Welding
Characteristics and Speed Requirements: Laser welding is a high - precision, high - energy - density welding method with a very fast welding speed. It uses a laser beam as a heat source, which can achieve a very small heat - affected zone and a high welding speed. The welding speed of laser welding can reach several meters per minute. For example, when welding thin plate materials (such as precision parts with a thickness of less than 3 mm), the welding speed can reach 1 - 5 m/min, greatly improving the welding efficiency.

Factors Affecting Speed: The welding speed of laser welding is mainly affected by factors such as laser power, spot diameter, material thickness, and the absorption rate of the material to the laser. Higher laser power and an appropriate spot diameter can accelerate the welding speed. For thinner materials, since less energy is required, the welding speed can be faster. The higher the absorption rate of the material to the laser, the easier the welding process is, and the welding speed can also be increased accordingly.

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