{"id":4909,"date":"2025-05-26T12:12:18","date_gmt":"2025-05-26T06:42:18","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=4909"},"modified":"2025-07-26T08:00:40","modified_gmt":"2025-07-26T02:30:40","slug":"strength-of-welded-joints","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/strength-of-welded-joints","title":{"rendered":"Strength of Welded Joints"},"content":{"rendered":"<h2 style=\"text-align: justify;\">(i) Strength of Butt Weld<\/h2>\n<p style=\"text-align: justify;\">A butt welded joint, subjected to tensile force P, is shown in given figure.<br \/>\nHere,<br \/>\n\u03c3t = Tensile stress in weld<br \/>\nP = Tensile force on the plates (N)<br \/>\nh = Throat of Butt weld<br \/>\nt = Thickness of plate<br \/>\nl = Length of weld<\/p>\n<p style=\"text-align: justify;\">\u03c3t = P\/hl<\/p>\n<p style=\"text-align: justify;\">Because reinforcement is provided to compensate for flaws in the weld, equating throat of the weld \u2018h\u2019 to the plate thickness \u2018t\u2019.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4910 aligncenter\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2025\/05\/butt-weld.jpg\" alt=\" Butt Weld\" width=\"270\" height=\"226\" \/><\/p>\n<p style=\"text-align: justify;\">\u03c3t = p\/lt<\/p>\n<p style=\"text-align: justify;\">For safety, there must be reduction in strength of a butt <a href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/types-of-welded-joint\/\" target=\"_blank\" rel=\"noopener\">welded joint<\/a> by a factor called \u201cEfficiency of Joint\u201d.<\/p>\n<p style=\"text-align: justify;\">P = \u03b7 \u03c3t t l<\/p>\n<p style=\"text-align: justify;\">\u03b7 = Efficiency of welded joint<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_1 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/strength-of-welded-joints\/#ii-Strength-of-Parallel-Fillet-Joint\" >(ii) Strength of Parallel Fillet Joint<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.madeeasy.in\/study\/me\/machine-design\/strength-of-welded-joints\/#iii-Strength-of-Transverse-Fillet-Weld\" >(iii) Strength of Transverse Fillet Weld<\/a><\/li><\/ul><\/nav><\/div>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"ii-Strength-of-Parallel-Fillet-Joint\"><\/span>(ii) Strength of Parallel Fillet Joint<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">A parallel fillet weld subjected to a tensile force P is shown below.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4911 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2025\/05\/fillet-weld-1.jpg\" alt=\"Fillet weld\" width=\"346\" height=\"156\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/05\/fillet-weld-1.jpg 346w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/05\/fillet-weld-1-300x135.jpg 300w\" sizes=\"auto, (max-width: 346px) 100vw, 346px\" \/><\/p>\n<p style=\"text-align: justify;\">h = Leg of weld (size of weld)<br \/>\nt = Throat (it is the minimum cross-section of weld at 45\u00b0 to leg)<br \/>\nl = Length of weld<br \/>\nt = h cos (45\u00b0)<br \/>\nt = 0.707 h (for right-angle triangle with two equal side)<\/p>\n<p style=\"text-align: justify;\">Generally the leg length \u2018h\u2019 is equal to the plate thickness.Because failure of the fillet weld occurs due to shear along the minimum cross-section of the weld.<\/p>\n<p style=\"text-align: justify;\">Permissible shear stress, \u03c4max = P\/tl = P\/ 0.707hl<\/p>\n<p style=\"text-align: justify;\">If there are two welds of equal length on two equal side of vertical plate.<\/p>\n<p style=\"text-align: justify;\">\u03c4max = P\/ 1.414hl<\/p>\n<p style=\"text-align: justify;\">As per American Welding Society (AWS), permissible shear stress for fillet weld is 94 N\/mm2 in case of static load.<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"iii-Strength-of-Transverse-Fillet-Weld\"><\/span>(iii) Strength of Transverse Fillet Weld<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">A transverse fillet weld subjected to a tensile force P is given below<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4912 aligncenter\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2025\/05\/fillet-weld.png\" alt=\"Fillet Weld\" width=\"247\" height=\"123\" \/><\/p>\n<p style=\"text-align: justify;\">This weld is subjected to tensile stress and failure will occur at minimum cross-section of weld at throat.<\/p>\n<p style=\"text-align: justify;\">Permissible <a href=\"https:\/\/study.madeeasy.in\/ce\/design-of-steel-structures\/tensile-strength\/\" target=\"_blank\" rel=\"noopener\">tensile stress<\/a>, \u03c3t =P\/tl = P\/ 0.707hl<\/p>\n<p style=\"text-align: justify;\">If there are weld of equal length \u03c3t =P\/ 1.414hl<\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-danger\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/types-of-welded-joint\/\" target=\"_blank\" rel=\"noopener\">&lt;&lt; Previous<\/a> | <a class=\"btn btn-success\" role=\"button\" href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/riveted-joint\/\" target=\"_blank\" rel=\"noopener\"> Next &gt;&gt;<\/a><br \/>\n<strong> Must Read: <\/strong> <a href=\"https:\/\/study.madeeasy.in\/me\/machine-design\/strength-of-welded-joints\/\" target=\"_blank\" rel=\"noopener\"><strong>What is Machine Design?<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(i) Strength of Butt Weld A butt welded joint, subjected to tensile force P, is shown in given figure. Here,<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1543,10],"tags":[877,1555,1556,1557],"class_list":["post-4909","post","type-post","status-publish","format-standard","hentry","category-machine-design","category-me","tag-fillet-weld","tag-strength-of-butt-weld","tag-strength-of-parallel-fillet-joint","tag-strength-of-transverse-fillet-weld"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=4909"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4909\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=4909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=4909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=4909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}