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4.4 WELDING REQUIREMENTS FOR SPECIFIC STEELS4.4.1 Weathering SteelsA special requirement associated with welding weathering steels in general involves the selection of the filler metals, with specific focus on ensuring the weld has atmospheric corrosion resistance equal to that of the base metal. One of two approaches may be taken. First, all welds on weathering steel structures may be made with alloy filler metals that deposit weld metal with a sufficient alloy content so that the deposit has a weathering composition. While a variety of alloys may be used, the common choice today is to use nickel bearing filler metals, typically with a nominal nickel content of 1 percent or greater. Prequalified filler metals for prequalified weathering steels are listed in AWS D1.1 Table 3.3.
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