低変態温度溶接材料を用いた高張力鋼溶接継手の大気腐食挙動

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When low transformation-temperature welding consumables are applied to welding of high strength steels, there is chemical mismatch between high strength base metal and the Cr-Ni system low transformation-temperature weld metal. The chemical mismatch may affect galvanic corrosion of welds in outdoor steel structures such as a bridge. In this study, atmospheric corrosion behavior was investigated for chemically mismatching weld joints formed by low transformation-temperature welding consumables. Corrosion depth profile at weld interface was measured by using laser microscope after outdoor exposure test of a year and the measured profiles were analyzed by plotting on Gumbel probability paper. Results of measurement and analysis showed that corrosion depth of base metal was independent on Cr content of weld metals and distance from weld interface. In order to clarify why galvanic corrosion did not occur at chemically mismatching weld joints, polarization tests of high strength steels were carried out after wet/dry corrosion test. It was found by polarization curves that corrosion current of high strength steel with rust increase remarkably with growth of rust and could become over 10 times larger than galvanic current which induced by couple of high strength steel and low transformation-temperature weld metal. Consequently, it was considered that galvanic corrosion would not be a problem in use of low transformation-temperature welding consumables for high strength steel structure which exposed to outdoor environment.
社団法人溶接学会の論文
2006-11-05

低変態温度溶接材料を用いた高張力鋼溶接継手の大気腐食挙動

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