{"id":16017,"date":"2026-09-09T06:46:06","date_gmt":"2026-09-09T06:46:06","guid":{"rendered":"https:\/\/www.hndfcrane.com\/?post_type=posts&#038;p=16017"},"modified":"2026-09-09T09:40:34","modified_gmt":"2026-09-09T09:40:34","slug":"crane-drum-web-to-shaft-weld-crack-cause-analysis","status":"publish","type":"posts","link":"https:\/\/www.hndfcrane.com\/ja\/posts\/crane-drum-web-to-shaft-weld-crack-cause-analysis\/","title":{"rendered":"\u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u306e\u30a6\u30a7\u30d6\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306e\u4e80\u88c2\u539f\u56e0\u5206\u6790"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>\u76ee\u6b21<\/p><nav><ul><li><a href=\"#1-relationship-between-the-crane-drum-web-plate-hub-and-shaft\">1. \u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3001\u30cf\u30d6\u3001\u30b7\u30e3\u30d5\u30c8\u306e\u95a2\u4fc2<\/a><\/li><li><a href=\"#2-why-the-crack-appears-near-the-drum-shaft-side\">2. \u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u5074\u4ed8\u8fd1\u306b\u4e80\u88c2\u304c\u767a\u751f\u3059\u308b\u7406\u7531<\/a><ul><li><a href=\"#2-1-stress-concentration-from-a-sudden-section-change\">2.1 \u6025\u6fc0\u306a\u65ad\u9762\u5909\u5316\u306b\u3088\u308b\u5fdc\u529b\u96c6\u4e2d<\/a><\/li><li><a href=\"#2-2-cyclic-stress-and-impact-loading\">2.2 \u7e70\u308a\u8fd4\u3057\u5fdc\u529b\u3068\u885d\u6483\u8377\u91cd<\/a><\/li><li><a href=\"#2-3-welding-residual-stress\">2.3 \u6eb6\u63a5\u6b8b\u7559\u5fdc\u529b<\/a><\/li><\/ul><\/li><li><a href=\"#3-development-process-of-the-web-plate-crack\">3. \u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u4e80\u88c2\u767a\u751f\u904e\u7a0b<\/a><\/li><li><a href=\"#4-common-causes-of-crane-drum-web-to-shaft-weld-cracking\">4. \u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u306e\u30a6\u30a7\u30d6\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306e\u4e80\u88c2\u306e\u4e00\u822c\u7684\u306a\u539f\u56e0<\/a><ul><li><a href=\"#4-1-structural-design-factors\">4.1 \u69cb\u9020\u8a2d\u8a08\u8981\u56e0<\/a><\/li><li><a href=\"#4-2-welding-quality-factors\">4.2 \u6eb6\u63a5\u54c1\u8cea\u8981\u56e0<\/a><\/li><li><a href=\"#4-3-operating-loads-beyond-design-conditions\">4.3 \u8a2d\u8a08\u6761\u4ef6\u3092\u8d85\u3048\u308b\u904b\u8ee2\u8ca0\u8377<\/a><\/li><li><a href=\"#4-4-manufacturing-and-assembly-errors\">4.4 \u88fd\u9020\u304a\u3088\u3073\u7d44\u307f\u7acb\u3066\u30a8\u30e9\u30fc<\/a><\/li><li><a href=\"#4-5-corrosion-and-environmental-factors\">4.5 \u8150\u98df\u3068\u74b0\u5883\u8981\u56e0<\/a><\/li><\/ul><\/li><li><a href=\"#5-inspection-repair-and-prevention-measures\">5\uff0e\u70b9\u691c\u3001\u4fee\u7406\u3001\u304a\u3088\u3073\u4e88\u9632\u63aa\u7f6e<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<p>\u3053\u306e\u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u6eb6\u63a5\u90e8\u306e\u4e80\u88c2\u89e3\u6790\u3067\u306f\u3001\u9577\u671f\u9593\u4f7f\u7528\u3055\u308c\u305f\u30af\u30ec\u30fc\u30f3\u306b\u304a\u3044\u3066\u3001\u30c9\u30e9\u30e0\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3068\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306b\u4e80\u88c2\u304c\u767a\u751f\u3057\u305f\u4e8b\u4f8b\u3092\u691c\u8a3c\u3059\u308b\u3002\u76ee\u306b\u898b\u3048\u308b\u640d\u50b7\u306f\u5c40\u6240\u7684\u306a\u91d1\u5c5e\u75b2\u52b4\u306b\u3088\u308b\u3082\u306e\u3068\u601d\u308f\u308c\u308b\u304c\u3001\u305d\u306e\u6839\u672c\u539f\u56e0\u306b\u306f\u3001\u69cb\u9020\u8a2d\u8a08\u3001\u6eb6\u63a5\u624b\u9806\u3001\u6750\u6599\u306e\u72b6\u614b\u3001\u5fdc\u529b\u4f1d\u9054\u3001\u88fd\u9020\u304a\u3088\u3073\u7d44\u7acb\u54c1\u8cea\u3001\u904b\u8ee2\u6761\u4ef6\u306a\u3069\u304c\u95a2\u4fc2\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1080\" height=\"720\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/09\/Cracking-of-the-weld-between-the-drum-web-and-the-drum-shaft.jpg\" alt=\"\" class=\"wp-image-16020\"\/><figcaption class=\"wp-element-caption\">\u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u306e\u30a6\u30a7\u30d6\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306e\u4e80\u88c2\u4e8b\u4f8b<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1477\" height=\"1065\" src=\"https:\/\/www.hndfcrane.com\/wp-content\/uploads\/2026\/09\/Schematic-diagram-of-the-cracking-location-in-the-weld-between-the-drum-web-and-the-drum-shaft.png\" alt=\"\" class=\"wp-image-16021\"\/><figcaption class=\"wp-element-caption\">\u30c9\u30e9\u30e0\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3068\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306b\u304a\u3051\u308b\u4e80\u88c2\u306e\u4f4d\u7f6e<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-relationship-between-the-crane-drum-web-plate-hub-and-shaft\">1. \u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3001\u30cf\u30d6\u3001\u30b7\u30e3\u30d5\u30c8\u306e\u95a2\u4fc2<\/h2>\n\n\n\n<p>\u6607\u964d\u88c5\u7f6e\u306b\u304a\u3044\u3066\u3001\u30c9\u30e9\u30e0\u306f\u30ef\u30a4\u30e4\u30fc\u30ed\u30fc\u30d7\u3092\u5dfb\u304d\u53d6\u308a\u3001\u8377\u7269\u3092\u6301\u3061\u4e0a\u3052\u305f\u308a\u5f15\u3063\u5f35\u3063\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u91cd\u8981\u306a\u4f1d\u52d5\u90e8\u54c1\u3067\u3059\u3002\u30c9\u30e9\u30e0\u30b7\u30a7\u30eb\u306f\u30ef\u30a4\u30e4\u30fc\u30ed\u30fc\u30d7\u3092\u53ce\u5bb9\u3057\u3001\u901a\u5e38\u3001\u30b7\u30a7\u30eb\u306e\u4e21\u7aef\u306b\u306f\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u304c\u914d\u7f6e\u3055\u308c\u3001\u30b7\u30a7\u30eb\u3092\u30cf\u30d6\u307e\u305f\u306f\u30b7\u30e3\u30d5\u30c8\u306b\u63a5\u7d9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u69cb\u9020\u3067\u306f\u3001\u30cf\u30d6\u306f\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u4e2d\u592e\u306b\u6eb6\u63a5\u3055\u308c\u307e\u3059\u3002\u30cf\u30d6\u306f\u30ad\u30fc\u3092\u4ecb\u3057\u3066\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306b\u63a5\u7d9a\u3055\u308c\u3001\u30b7\u30e3\u30d5\u30c8\u306f\u30d9\u30a2\u30ea\u30f3\u30b0\u306b\u3088\u3063\u3066\u652f\u6301\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306f\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306b\u76f4\u63a5\u6eb6\u63a5\u3055\u308c\u3001\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306f\u9577\u3044\u30b7\u30e3\u30d5\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306f\u5358\u306a\u308b\u63a5\u7d9a\u677f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30c9\u30e9\u30e0\u30b7\u30a7\u30eb\u3068\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u306e\u9593\u3067\u30c8\u30eb\u30af\u3068\u534a\u5f84\u65b9\u5411\u306e\u529b\u3092\u4f1d\u9054\u3059\u308b\u5f79\u5272\u3082\u62c5\u3063\u3066\u3044\u307e\u3059\u3002\u30c9\u30e9\u30e0\u306e\u4e00\u822c\u7684\u306a\u6545\u969c\u306b\u95a2\u3059\u308b\u6587\u732e\u3067\u306f\u3001\u4ea4\u63db\u304c\u5fc5\u8981\u3068\u306a\u308b\u6761\u4ef6\u3068\u3057\u3066\u75b2\u52b4\u4e80\u88c2\u304c\u3088\u304f\u6319\u3052\u3089\u308c\u307e\u3059\u304c\u3001\u672c\u4e8b\u4f8b\u3067\u306f\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u4ed8\u8fd1\u3067\u4e80\u88c2\u304c\u767a\u751f\u3059\u308b\u7406\u7531\u306b\u3064\u3044\u3066\u3001\u3088\u308a\u5177\u4f53\u7684\u306b\u8003\u5bdf\u3057\u307e\u3059\u3002 <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-why-the-crack-appears-near-the-drum-shaft-side\">2. \u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u5074\u4ed8\u8fd1\u306b\u4e80\u88c2\u304c\u767a\u751f\u3059\u308b\u7406\u7531<\/h2>\n\n\n\n<p>\u6a5f\u68b0\u7684\u306a\u89b3\u70b9\u304b\u3089\u898b\u308b\u3068\u3001\u30c9\u30e9\u30e0\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306f\u3001\u306d\u3058\u308a\u3001\u66f2\u3052\u3001\u5f15\u5f35\u5727\u7e2e\u3001\u9762\u5185\u305b\u3093\u65ad\u3092\u53d7\u3051\u308b\u8584\u677f\u3067\u3042\u308b\u3002\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u4ed8\u8fd1\u3067\u306f\u3001\u65ad\u9762\u306e\u6025\u6fc0\u306a\u5909\u5316\u3001\u6eb6\u63a5\u90e8\u306e\u5f71\u97ff\u3001\u7e70\u308a\u8fd4\u3057\u8377\u91cd\u306a\u3069\u3001\u8907\u6570\u306e\u597d\u307e\u3057\u304f\u306a\u3044\u6761\u4ef6\u304c\u540c\u6642\u306b\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-1-stress-concentration-from-a-sudden-section-change\">2.1 \u6025\u6fc0\u306a\u65ad\u9762\u5909\u5316\u306b\u3088\u308b\u5fdc\u529b\u96c6\u4e2d<\/h3>\n\n\n\n<p>\u30c9\u30e9\u30e0\u8ef8\u306b\u8fd1\u3044\u90e8\u5206\u3067\u306f\u3001\u69cb\u9020\u306f\u6bd4\u8f03\u7684\u539a\u3044\u8ef8\u304b\u3089\u8584\u3044\u30a6\u30a7\u30d6\u677f\u3078\u3068\u79fb\u884c\u3059\u308b\u3002\u8ef8\u65b9\u5411\u306e\u4f4d\u7f6e\u6c7a\u3081\u3084\u6eb6\u63a5\u306e\u305f\u3081\u306b\u3001\u5bfe\u5fdc\u3059\u308b\u30a6\u30a7\u30d6\u677f\u306e\u4f4d\u7f6e\u306b\u8ef8\u80a9\u90e8\u304c\u8a2d\u3051\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u79fb\u884c\u534a\u5f84\u304c\u5c0f\u3055\u3059\u304e\u305f\u308a\u3001\u79fb\u884c\u304c\u6ed1\u3089\u304b\u3067\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u3068\u3001\u5fdc\u529b\u96c6\u4e2d\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<p>\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3084\u6eb6\u3051\u8fbc\u307f\u4e0d\u8db3\u306a\u3069\u306e\u6eb6\u63a5\u6b20\u9665\u3082\u3001\u4e80\u88c2\u767a\u751f\u6e90\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-2-cyclic-stress-and-impact-loading\">2.2 \u7e70\u308a\u8fd4\u3057\u5fdc\u529b\u3068\u885d\u6483\u8377\u91cd<\/h3>\n\n\n\n<p>\u30c9\u30e9\u30e0\u304c\u4f5c\u52d5\u3059\u308b\u969b\u3001\u30ef\u30a4\u30e4\u30fc\u30ed\u30fc\u30d7\u306e\u5dfb\u304d\u53d6\u308a\u306b\u3088\u3063\u3066\u767a\u751f\u3057\u305f\u5f15\u5f35\u529b\u306f\u3001\u30c9\u30e9\u30e0\u30b7\u30a7\u30eb\u3092\u901a\u3057\u3066\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306b\u4f1d\u9054\u3055\u308c\u3001\u3055\u3089\u306b\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u3078\u3068\u4f1d\u308f\u308a\u307e\u3059\u3002\u5dfb\u304d\u53d6\u308a\u3068\u6301\u3061\u4e0a\u3052\u306e\u5404\u52d5\u4f5c\u306b\u3088\u3063\u3066\u3001\u3053\u306e\u9818\u57df\u306b\u306f\u7e70\u308a\u8fd4\u3057\u8377\u91cd\u304c\u304b\u304b\u308a\u3001\u5c40\u6240\u7684\u306a\u885d\u6483\u8377\u91cd\u3068\u76f8\u307e\u3063\u3066\u3001\u4f4e\u30b5\u30a4\u30af\u30eb\u75b2\u52b4\u3068\u3057\u3066\u4f5c\u7528\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-3-welding-residual-stress\">2.3 \u6eb6\u63a5\u6b8b\u7559\u5fdc\u529b<\/h3>\n\n\n\n<p>\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3068\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u3092\u6eb6\u63a5\u3059\u308b\u969b\u3001\u6eb6\u63a5\u90e8\u306f\u5c40\u6240\u7684\u306b\u9ad8\u6e29\u306b\u306a\u308a\u3001\u51b7\u5374\u53ce\u7e2e\u304c\u751f\u3058\u307e\u3059\u3002\u6eb6\u63a5\u5f8c\u306b\u6eb6\u63a5\u69cb\u9020\u304c\u5b8c\u5168\u306b\u713c\u304d\u306a\u307e\u3057\u307e\u305f\u306f\u5fdc\u529b\u9664\u53bb\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u6eb6\u63a5\u90e8\u5468\u8fba\u306b\u6b8b\u7559\u5f15\u5f35\u5fdc\u529b\u304c\u6b8b\u308a\u307e\u3059\u3002\u3053\u306e\u6b8b\u7559\u5f15\u5f35\u5fdc\u529b\u306b\u904b\u8ee2\u8377\u91cd\u304c\u52a0\u308f\u308b\u3068\u3001\u4e80\u88c2\u767a\u751f\u306e\u53ef\u80fd\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-development-process-of-the-web-plate-crack\">3. \u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u4e80\u88c2\u767a\u751f\u904e\u7a0b<\/h2>\n\n\n\n<p>\u4e80\u88c2\u306e\u767a\u751f\u306f\u30013\u3064\u306e\u6bb5\u968e\u306b\u5206\u3051\u3066\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u6bb5\u968e\u306f\u767a\u751f\u6bb5\u968e\u3067\u3059\u3002\u6eb6\u63a5\u30eb\u30fc\u30c8\u90e8\u307e\u305f\u306f\u9077\u79fb\u534a\u5f84\u90e8\u3067\u306f\u3001\u6eb6\u63a5\u6b8b\u7559\u5fdc\u529b\u3068\u4f7f\u7528\u5fdc\u529b\u306e\u8907\u5408\u4f5c\u7528\u306b\u3088\u308a\u3001\u5fae\u7d30\u306a\u6b20\u9665\u304c\u4e80\u88c2\u306e\u767a\u751f\u6e90\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7b2c2\u6bb5\u968e\u306f\u4e80\u88c2\u306e\u4f1d\u64ad\u3067\u3059\u3002\u5404\u540a\u308a\u4e0a\u3052\u4f5c\u696d\u306b\u304a\u3044\u3066\u3001\u8377\u91cd\u306f\u540c\u3058\u4f1d\u9054\u7d4c\u8def\u3092\u305f\u3069\u308a\u3001\u6700\u5927\u5fdc\u529b\u304c\u7e70\u308a\u8fd4\u3055\u308c\u307e\u3059\u3002\u4e80\u88c2\u306f\u6750\u6599\u306e\u7c92\u754c\u306b\u6cbf\u3063\u3066\u5f90\u3005\u306b\u4f1d\u64ad\u3057\u307e\u3059\u3002\u7834\u65ad\u9762\u306b\u306f\u3001\u653e\u5c04\u72b6\u307e\u305f\u306f\u8c9d\u6bbb\u72b6\u306e\u7279\u5fb4\u304c\u73fe\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7b2c3\u6bb5\u968e\u306f\u7834\u58ca\u3067\u3059\u3002\u6b8b\u308a\u306e\u6709\u52b9\u65ad\u9762\u7a4d\u304c\u8377\u91cd\u3092\u652f\u3048\u308b\u306e\u306b\u5341\u5206\u3067\u306a\u304f\u306a\u308b\u3068\u3001\u7a81\u7136\u8106\u6027\u7834\u58ca\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u5f15\u304d\u88c2\u304d\u3084\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u304b\u3089\u306e\u5206\u96e2\u3092\u4f34\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-common-causes-of-crane-drum-web-to-shaft-weld-cracking\">4. \u30af\u30ec\u30fc\u30f3\u30c9\u30e9\u30e0\u306e\u30a6\u30a7\u30d6\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u6eb6\u63a5\u90e8\u306e\u4e80\u88c2\u306e\u4e00\u822c\u7684\u306a\u539f\u56e0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-1-structural-design-factors\">4.1 \u69cb\u9020\u8a2d\u8a08\u8981\u56e0<\/h3>\n\n\n\n<p>\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u3068\u30cf\u30d6\u307e\u305f\u306f\u30c9\u30e9\u30e0\u30b7\u30e3\u30d5\u30c8\u3068\u306e\u63a5\u5408\u90e8\u306b\u304a\u3044\u3066\u9069\u5207\u306a\u534a\u5f84\u304c\u7528\u3044\u3089\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u5fdc\u529b\u304c\u6025\u6fc0\u306b\u5909\u5316\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u539a\u307f\u304c\u4e0d\u5341\u5206\u306a\u5834\u5408\u3001\u75b2\u52b4\u5f37\u5ea6\u30de\u30fc\u30b8\u30f3\u3082\u4e0d\u8db3\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u6eb6\u63a5\u4f4d\u7f6e\u306e\u9078\u629e\u304c\u4e0d\u9069\u5207\u3067\u3042\u308b\u3068\u3001\u7279\u306b\u6eb6\u63a5\u90e8\u304c\u4f4e\u5fdc\u529b\u9818\u57df\u3067\u306f\u306a\u304f\u9ad8\u5fdc\u529b\u9818\u57df\u306b\u3042\u308b\u5834\u5408\u3001\u30ea\u30b9\u30af\u306f\u3055\u3089\u306b\u9ad8\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-2-welding-quality-factors\">4.2 \u6eb6\u63a5\u54c1\u8cea\u8981\u56e0<\/h3>\n\n\n\n<p>\u4e00\u822c\u7684\u306a\u6eb6\u63a5\u6b20\u9665\u306b\u306f\u3001\u6eb6\u3051\u8fbc\u307f\u4e0d\u8db3\u3001\u30b9\u30e9\u30b0\u6df7\u5165\u3001\u6c17\u5b54\u3001\u30a2\u30f3\u30c0\u30fc\u30ab\u30c3\u30c8\u3001\u6eb6\u63a5\u75d5\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002\u6eb6\u63a5\u5f8c\u306b\u8d85\u97f3\u6ce2\u63a2\u50b7\u691c\u67fb\u3084\u653e\u5c04\u7dda\u900f\u904e\u691c\u67fb\u306a\u3069\u306e\u975e\u7834\u58ca\u691c\u67fb\u3092\u5b9f\u65bd\u3057\u306a\u3044\u3068\u3001\u96a0\u308c\u305f\u6b20\u9665\u304c\u9577\u671f\u9593\u69cb\u9020\u7269\u5185\u306b\u6b8b\u5b58\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6eb6\u63a5\u6761\u4ef6\u306e\u6700\u9069\u5316\u4e0d\u8db3\u3084\u6eb6\u63a5\u5f8c\u306e\u5fdc\u529b\u9664\u53bb\u51e6\u7406\u306e\u4e0d\u5341\u5206\u3055\u3082\u3001\u30ea\u30b9\u30af\u3092\u9ad8\u3081\u308b\u8981\u56e0\u3068\u306a\u308a\u307e\u3059\u3002\u5927\u578b\u30c9\u30e9\u30e0\u69cb\u9020\u306e\u5834\u5408\u3001\u5fdc\u529b\u9664\u53bb\u306e\u305f\u3081\u306e\u71b1\u51e6\u7406\u306f\u5b9f\u65bd\u304c\u96e3\u3057\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u632f\u52d5\u306b\u3088\u308b\u5fdc\u529b\u9664\u53bb\u51e6\u7406\u3082\u5b8c\u5168\u306b\u306f\u9069\u7528\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u3001\u81ea\u7136\u6642\u52b9\u51e6\u7406\u3084\u305d\u306e\u4ed6\u306e\u6642\u52b9\u51e6\u7406\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u8981\u4ef6\u306b\u3088\u3063\u3066\u5f71\u97ff\u3092\u53d7\u3051\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-3-operating-loads-beyond-design-conditions\">4.3 \u8a2d\u8a08\u6761\u4ef6\u3092\u8d85\u3048\u308b\u904b\u8ee2\u8ca0\u8377<\/h3>\n\n\n\n<p>\u5b9a\u683c\u8377\u91cd\u3092\u8d85\u3048\u308b\u904e\u8ca0\u8377\u304c\u9577\u671f\u9593\u7d9a\u304f\u3068\u3001\u69cb\u9020\u7269\u306e\u75b2\u52b4\u30ea\u30b9\u30af\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002\u540a\u308a\u4e0a\u3052\u4f5c\u696d\u4e2d\u306e\u983b\u7e41\u306a\u59cb\u52d5\u3068\u5236\u52d5\u306f\u3001\u5927\u304d\u306a\u885d\u6483\u8377\u91cd\u3092\u767a\u751f\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30ef\u30a4\u30e4\u30fc\u30ed\u30fc\u30d7\u304c\u30c9\u30e9\u30e0\u4e0a\u306b\u4e0d\u9069\u5207\u306b\u914d\u7f6e\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30c9\u30e9\u30e0\u306b\u304b\u304b\u308b\u529b\u306e\u5206\u5e03\u304c\u4e0d\u5747\u4e00\u306b\u306a\u308a\u3001\u5c40\u6240\u7684\u306a\u5fdc\u529b\u304c\u8a2d\u8a08\u5024\u3092\u5927\u5e45\u306b\u8d85\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-4-manufacturing-and-assembly-errors\">4.4 \u88fd\u9020\u304a\u3088\u3073\u7d44\u307f\u7acb\u3066\u30a8\u30e9\u30fc<\/h3>\n\n\n\n<p>\u30a6\u30a7\u30d6\u30d7\u30ec\u30fc\u30c8\u306e\u5185\u7a74\u3068\u30b7\u30e3\u30d5\u30c8\u306e\u5d4c\u5408\u304c\u304d\u3064\u3059\u304e\u305f\u308a\u7de9\u3059\u304e\u305f\u308a\u3059\u308b\u3068\u3001\u521d\u671f\u306e\u5c40\u6240\u5fdc\u529b\u304c\u4e0d\u5747\u4e00\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5b8c\u5168\u306b\u89e3\u653e\u3055\u308c\u3066\u3044\u306a\u3044\u7d44\u307f\u7acb\u3066\u5fdc\u529b\u304c\u3001\u5f8c\u306b\u904b\u8ee2\u5fdc\u529b\u3068\u5408\u308f\u3055\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-5-corrosion-and-environmental-factors\">4.5 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