What are the environmental requirements for weatherproof plate welding?

What are the environmental requirements for weatherproof plate welding? The weathering plate has the characteristics of toughness, plastic casting, forming, welding and cutting, etching, high temperature, fatigue and so on. Aging resistance is 2 to 8 times that of ordinary carbon steel, spraying property is 1.5 to 10 times that of ordinary carbon steel, and can be thinned, exposed or simplified spraying applications. The steel grade has the characteristics of rust resistance, corrosion resistance and life prolonging, thinning and energy saving, saving time, environmental protection and energy saving, so as to benefit the makers and users of prefabricated components. The weathering board is used for the production and manufacture of Marine containers, railway vehicles, crude oil door crane, port engineering construction, oil production plant service platform and chemical plant oil equipment containing hydrogen chloride etched material utensils and other parts.

The higher the carbon equivalent of the weathering plate, the higher the carbon equivalent of the stainless steel plate, the greater the hardening tendency, the greater the cold cracking tendency of the welding thermal hazard area, and the worse the weldability of the stainless steel plate. There are three key factors leading to cold cracks in welding: 1. Hardening tendency of steel; 2, welding tensile stress; 3, the amount of peroxide welded joints and spread.

The low natural ambient temperature allowed for welding of the weathering plate is below:

1, alloy steel and general high alloy steel (A-Ⅰ class) : -10℃

2, alloy steel and general high alloy steel, heat strength steel and alloy tool steel (A-Ⅱ, Ⅲ, B-Ⅰ class) : 0℃

3, heat strength steel and alloy tool steel (B-Ⅱ, Ⅲ class) : 5℃

When any of the following conditions occur in the natural environment of welding, protective measures should be taken, otherwise welding is strictly prohibited:

1, manual arc welding wind speed of more than 8 meters /s. The wind speed of manual arc welding exceeds 1m/s;

2, air humidity more than 90%;

3, welding parts splash water, rain or touch fog;

4, when the temperature of the welding part is less than 0℃.

The welding site of the weatherproof plate shall have countermeasures such as wind resistance, rain resistance and freezing resistance. The use of alkaline low hydrogen type welding wire, flux. Partial alkali and low hydrogen welding wire and flux welding joint have low peroxide content, good flue gas desulfurization, dephosphorization and high fracture toughness. Before application, it is necessary to air dry 1-2h at a temperature of 350~C ~ 420~C, with the goal of reasonably removing the water in it, thereby reducing the oxygen content of the welded joint and reducing the cold cracking tendency of the joint head. The welding parts must be tested to meet the standards before they can be set, and can not be set with super strength to prevent excessive assembly ground stress. The position of stainless steel sheet to be welded and the 20 mm scope of each of the two should be carefully removed to remove moisture, rust, oil stains and other dirt. Scientific arrangement of welding sequence. The standard is to make most of the welding can be welded under the standard of small bending stiffness as far as possible, and further reduce the welding ground stress.

Weathering steel fireball

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