Paint Coating Thickness Distribution at Fillet Weld Part and its Effects on Corrosion Fatigue Strength of Fillet weld Joint

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  • 隅肉溶接部の塗膜厚分布と腐食疲労強度改善効果
  • 隅肉溶接部の塗膜厚分布と腐食疲労強度改善効果〔含 討論〕
  • スミニク ヨウセツブ ノ トマクアツ ブンプ ト フショク ヒロウ キョウド

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Abstract

Corrosion preventing characteristics of paint coating on steel plates depend on many factors relating to the method to coat. One of the most important factors is the coating thickness distribution. This distribution is mainly determined by detailed configuration of structures to be coated. Corrosion fatigue strength of paint coated fillet weld joint was experimentally investigated from the view point to evaluate the effects of coating thickness distribution on the corrosion preventing characteristics of coating film. Three kinds of T-figured fillet weld joint test specimens were tested in air or in artificial ocean water (SOW), under pulsating bending load. Coating thickness distribution around fillet weld parts were measured and evaluated by σ/t_m (σ-standard deviation of coating thickness distribution, t_m-mean value of coating thickness). Three configurations of fillet weld were adopted. They were "as weld", "weld metal cut by straight line" and "weld metal dressed by Φ 12". Conclusions obtained are as following. (1) Coating thickness distributions at weld part are largely affected by fillet weld detailed configurations. (2) Fatigue strength of filled weld joint test specimens without coating film depends largely on their configuration at higher stress level, but not depends on the configuration at lower stress level. (3) Corrosion fatigue strength of fillet weld joint test specimens with coating film is almost same as that of joint specimens in air, if the coating thickness distribution level is good enough. (4) Bad coating thickness distribution results in the reduction of corrosion fatigue strength of weld joint specimens even at higcer stress level. It is because that the coating breaks at bad coating distriution part at early stage of fatigue loading. (5) Thus the evaluation of coating thickness distribution at weld parts can be determined by the comparison of corrosion fatigue strength of coated specimens with that of uncoated specimens in air.

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