{"id":5738,"date":"2026-10-24T15:15:03","date_gmt":"2026-10-24T13:15:03","guid":{"rendered":"https:\/\/shockwave-clad.com\/mil-j-24445a\/"},"modified":"2026-10-24T16:54:33","modified_gmt":"2026-10-24T14:54:33","slug":"mil-j-24445a-joints-transition-aluminium-acier","status":"publish","type":"post","link":"https:\/\/shockwave-clad.com\/fr\/mil-j-24445a-joints-transition-aluminium-acier\/","title":{"rendered":"MIL-J-24445A\u00a0: la sp\u00e9cification des joints de transition aluminium-acier"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.27.4&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.27.4&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.27.4&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.27.4&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n<p><strong>La MIL-J-24445A est la sp\u00e9cification militaire am\u00e9ricaine des assemblages bim\u00e9talliques aluminium-acier\u00a0: les joints de transition qui permettent aux chantiers navals de souder une superstructure en aluminium sur un pont en acier. Son titre complet est \u00ab Joint, Bimetallic Bonded, Aluminum to Steel \u00bb\u00a0; la r\u00e9vision A a \u00e9t\u00e9 publi\u00e9e par le Naval Sea Systems Command en 1977.<\/strong> R\u00e9dig\u00e9e pour l&rsquo;US Navy, elle est devenue la sp\u00e9cification de r\u00e9f\u00e9rence des joints de transition structurels dans le monde entier, et les chantiers comme les soci\u00e9t\u00e9s de classification la demandent couramment.<\/p>\n<h2>Ce que couvre la sp\u00e9cification<\/h2>\n<p>La MIL-J-24445A s&rsquo;applique aux joints de transition aluminium-acier fabriqu\u00e9s par soudage par explosion ou par plaquage par laminage. Les joints sont d\u00e9coup\u00e9s dans une t\u00f4le plaqu\u00e9e et peuvent \u00eatre livr\u00e9s en barres, bandes, disques, anneaux ou rectangles. Les joints r\u00e9alis\u00e9s par soudage ou brasage sont exclus\u00a0: l&rsquo;aluminium ne peut pas \u00eatre soud\u00e9 par fusion sur l&rsquo;acier, car les deux m\u00e9taux forment des compos\u00e9s interm\u00e9talliques fragiles. Une couche interm\u00e9diaire en aluminium (par exemple de l&rsquo;aluminium pur entre l&rsquo;acier et l&rsquo;alliage 5083) est admise lorsque le proc\u00e9d\u00e9 de liaison l&rsquo;exige.<\/p>\n<p>L&rsquo;usage pr\u00e9vu concerne les structures soud\u00e9es o\u00f9 l&rsquo;acier doit \u00eatre assembl\u00e9 \u00e0 l&rsquo;aluminium, comme un roof en aluminium sur un pont en acier. La sp\u00e9cification pr\u00e9cise elle-m\u00eame que les joints sont destin\u00e9s \u00e0 un service structurel atmosph\u00e9rique et sec et qu&rsquo;ils doivent \u00eatre rev\u00eatus pour \u00e9viter la corrosion galvanique \u2013 voir <a href=\"https:\/\/shockwave-clad.com\/fr\/corrosion-galvanique-aluminium-acier\/\">corrosion galvanique entre aluminium et acier<\/a>.<\/p>\n<h2>Exigences m\u00e9caniques<\/h2>\n<table style=\"width:100%;border-collapse:collapse;margin-bottom:25px\">\n<tr>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">Propri\u00e9t\u00e9<\/th>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">Exigence<\/th>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">Essai<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">R\u00e9sistance \u00e0 la traction de la liaison<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">\u2265 11 000 psi (75,8 MPa)<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Essai de traction au v\u00e9rin (ram tensile), \u00e0 l&rsquo;\u00e9tat plaqu\u00e9 et apr\u00e8s le cycle de soudage simul\u00e9<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">R\u00e9sistance au cisaillement de la liaison<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">\u2265 8 000 psi (55,2 MPa)<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Essai de cisaillement triple (triple lug), \u00e0 l&rsquo;\u00e9tat plaqu\u00e9 (et apr\u00e8s le cycle de soudage pour le premier article)<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Cycle de soudage simul\u00e9<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">315 \u00b0C \u00b1 14 \u00b0C (600 \u00b0F \u00b1 25 \u00b0F) pendant 15 minutes<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Appliqu\u00e9 avant de reprendre l&rsquo;essai de traction (et de cisaillement)<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Essai de pliage<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Aucune s\u00e9paration de la liaison<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Pliage, ou cisaillement triple plus essai au burin au choix du fabricant<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Contr\u00f4le par ultrasons<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Aucune perte totale de l&rsquo;\u00e9cho de fond \u00e0 la liaison<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">100 % de la surface li\u00e9e de chaque joint, balayage continu<\/td>\n<\/tr>\n<\/table>\n<p>Le cycle de soudage simul\u00e9 est important en pratique\u00a0: il prouve que la liaison conserve sa r\u00e9sistance lorsque le joint s&rsquo;\u00e9chauffe pendant le soudage sur le pont et sur la superstructure. C&rsquo;est pourquoi on demande aux fabricants de maintenir l&rsquo;interface sous la limite indiqu\u00e9e par le fabricant du joint pendant le soudage.<\/p>\n<h2>Lots de production et essais<\/h2>\n<ul>\n<li><strong>Taille de lot\u00a0:<\/strong> un lot comprend au plus 10 t\u00f4les plaqu\u00e9es produites en m\u00eame temps dans les m\u00eames conditions. En soudage par explosion, changer de coul\u00e9es, d&rsquo;\u00e9paisseur de t\u00f4le, de taille ou de type de charge, de distance d&rsquo;\u00e9cartement, de proc\u00e9dure de nettoyage ou de dimensions d&rsquo;assemblage ouvre un nouveau lot.<\/li>\n<li><strong>\u00c9chantillonnage\u00a0:<\/strong> deux \u00e9chantillons pr\u00e9lev\u00e9s dans des coins diagonalement oppos\u00e9s d&rsquo;une t\u00f4le par lot, chacun donnant une \u00e9prouvette de traction et une de pliage.<\/li>\n<li><strong>Contre-essais\u00a0:<\/strong> un lot refus\u00e9 peut \u00eatre r\u00e9int\u00e9gr\u00e9 t\u00f4le par t\u00f4le avec deux essais de pliage et deux de traction par t\u00f4le\u00a0; une t\u00f4le dont une \u00e9prouvette \u00e9choue ne peut pas \u00eatre r\u00e9essay\u00e9e.<\/li>\n<li><strong>Ultrasons\u00a0:<\/strong> chaque joint, 100 % de la surface li\u00e9e\u00a0; toutes les zones d\u00e9fectueuses sont \u00e9limin\u00e9es.<\/li>\n<\/ul>\n<h2>Qualification de premier article<\/h2>\n<p>Avant de livrer selon la sp\u00e9cification, le fabricant doit d\u00e9montrer son proc\u00e9d\u00e9 par des essais de premier article sur des joints fabriqu\u00e9s exactement comme en production\u00a0:<\/p>\n<ul>\n<li>Essais de traction et de cisaillement de la liaison, \u00e0 l&rsquo;\u00e9tat plaqu\u00e9 et apr\u00e8s le cycle de soudage simul\u00e9.<\/li>\n<li>Essais de fatigue axiale de la compression \u00e0 la traction, jusqu&rsquo;\u00e0 1 000 000 de cycles\u00a0; toute rupture dans la liaison entra\u00eene le refus.<\/li>\n<li>Essais de traction sur \u00e9prouvette soud\u00e9e, l&rsquo;\u00e2me en aluminium \u00e9tant soud\u00e9e au MIG (GMAW)\u00a0: le joint doit rompre dans l&rsquo;\u00e2me ou au-del\u00e0 de la charge \u00e0 laquelle l&rsquo;\u00e2me devrait rompre.<\/li>\n<\/ul>\n<h2>Dimensions et plan\u00e9it\u00e9<\/h2>\n<p>Les barres ne doivent pas s&rsquo;\u00e9carter de la plan\u00e9it\u00e9 de plus de 1\/16 de pouce (1,6 mm) sur toute longueur de 12 pouces (305 mm), et les rives doivent \u00eatre rectilignes \u00e0 1\/8 de pouce (3,2 mm) pr\u00e8s sur 12 pouces. Ces tol\u00e9rances facilitent la mise en place le long des longues jonctions de superstructure.<\/p>\n<h2>Comment Triplate\u00ae satisfait la MIL-J-24445A<\/h2>\n<p><a href=\"https:\/\/shockwave-clad.com\/fr\/triplate\/\">Triplate\u00ae<\/a> est le joint de transition structurel de Shockwave\u00a0: acier de construction navale (nuance A, D ou DH36), aluminium pur 1050A et aluminium 5083 r\u00e9sistant \u00e0 l&rsquo;eau de mer, soud\u00e9s par explosion dans une chambre \u00e0 vide. Il satisfait la MIL-J-24445A et est approuv\u00e9 par Lloyd&rsquo;s Register, DNV et ABS.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin-bottom:25px\">\n<tr>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">Propri\u00e9t\u00e9<\/th>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">MIL-J-24445A<\/th>\n<th style=\"border:1px solid #ccc;padding:10px;text-align:left\">Triplate\u00ae<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">R\u00e9sistance \u00e0 la traction dans l&rsquo;\u00e9paisseur<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">\u2265 75,8 MPa<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">> 75 N\/mm\u00b2<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">R\u00e9sistance au cisaillement<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">\u2265 55,2 MPa<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">> 55 N\/mm\u00b2 (base\u2013couche interm\u00e9diaire)<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Essai de pliage<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Conforme<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Conforme (traction et compression)<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Ultrasons \/ interface<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Aucune perte d&rsquo;\u00e9cho de fond<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Interface 100 % dense, v\u00e9rifi\u00e9e par ressuage<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ccc;padding:10px\">Temp\u00e9rature maximale de mise en \u0153uvre<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">Liaison test\u00e9e apr\u00e8s 315 \u00b0C \/ 15 min<\/td>\n<td style=\"border:1px solid #ccc;padding:10px\">315 \u00b0C<\/td>\n<\/tr>\n<\/table>\n<p>Le plaquage sous vide \u00e9limine l&rsquo;air entre les t\u00f4les avant la liaison, de sorte que l&rsquo;interface est exempte d&rsquo;oxydes et de porosit\u00e9s. Des chantiers en Cor\u00e9e, aux Pays-Bas, en France, en Allemagne, en Finlande, en Italie, en Norv\u00e8ge, aux Philippines et en Am\u00e9rique du Sud utilisent Triplate\u00ae, et le Queen Mary 2 \u00e0 lui seul contient plus de 3 km de bande Triplate\u00ae. \u00c0 lire aussi\u00a0: <a href=\"https:\/\/shockwave-clad.com\/fr\/comment-souder-laluminium-a-lacier-les-methodes-qui\/\">comment souder l&rsquo;aluminium \u00e0 l&rsquo;acier<\/a>.<\/p>\n<h2>Commander selon la MIL-J-24445A<\/h2>\n<p>La sp\u00e9cification demande \u00e0 l&rsquo;acheteur d&rsquo;indiquer sur la commande\u00a0: le num\u00e9ro et la date de la sp\u00e9cification, si un essai de premier article est requis, les sp\u00e9cifications des mat\u00e9riaux de base acier et aluminium (et de la couche interm\u00e9diaire), le type et l&rsquo;\u00e9paisseur des \u00e9l\u00e9ments qui seront soud\u00e9s au joint, ainsi que les exigences d&#8217;emballage et de marquage. Envoyez-nous ces informations via notre <a href=\"https:\/\/shockwave-clad.com\/fr\/contact\/\">page de contact<\/a> et nous vous chiffrerons des bandes, t\u00f4les ou profils Triplate\u00ae d\u00e9coup\u00e9s au jet d&rsquo;eau.<\/p>\n<h2>Questions fr\u00e9quentes<\/h2>\n<h3>Qu&rsquo;est-ce que la MIL-J-24445A\u00a0?<\/h3>\n<p>La sp\u00e9cification militaire am\u00e9ricaine \u00ab Joint, Bimetallic Bonded, Aluminum to Steel \u00bb (r\u00e9vision A, 1977). Elle couvre les joints de transition plaqu\u00e9s par explosion ou par laminage utilis\u00e9s pour souder des structures en aluminium \u00e0 l&rsquo;acier, comme un roof en aluminium sur un pont en acier.<\/p>\n<h3>Quelle r\u00e9sistance exige la MIL-J-24445A\u00a0?<\/h3>\n<p>Une r\u00e9sistance \u00e0 la traction de la liaison d&rsquo;au moins 11 000 psi (75,8 MPa) et une r\u00e9sistance au cisaillement d&rsquo;au moins 8 000 psi (55,2 MPa), y compris apr\u00e8s un cycle de soudage simul\u00e9 de 600 \u00b0F (315 \u00b0C) pendant 15 minutes.<\/p>\n<h3>La MIL-J-24445A impose-t-elle un contr\u00f4le par ultrasons\u00a0?<\/h3>\n<p>Oui. 100 % de la surface li\u00e9e de chaque joint est contr\u00f4l\u00e9e par ultrasons, et toute perte totale de l&rsquo;\u00e9cho de fond \u00e0 la liaison entra\u00eene le refus.<\/p>\n<h3>La MIL-J-24445A est-elle r\u00e9serv\u00e9e aux navires de l&rsquo;US Navy\u00a0?<\/h3>\n<p>Non. Elle a \u00e9t\u00e9 r\u00e9dig\u00e9e pour l&rsquo;US Navy, mais les chantiers et soci\u00e9t\u00e9s de classification du monde entier l&rsquo;utilisent comme r\u00e9f\u00e9rence pour les joints de transition structurels aluminium-acier.<\/p>\n<h3>Triplate\u00ae est-il conforme \u00e0 la MIL-J-24445A\u00a0?<\/h3>\n<p>Oui. Triplate\u00ae satisfait la MIL-J-24445A et est approuv\u00e9 par Lloyd&rsquo;s Register, DNV et ABS.<\/p>\n<p><em>R\u00e9dig\u00e9 par Joeri Hofstede, PDG de Shockwave Metalworking Technologies \u2014 sp\u00e9cialistes du soudage par explosion sous vide depuis 1985.<\/em><\/p>\n<p>[\/et_pb_text][et_pb_code _builder_version=\u00a0\u00bb4.27.4&Prime; global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Qu'est-ce que la MIL-J-24445A\u00a0?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"La sp\u00e9cification militaire am\u00e9ricaine \u00ab Joint, Bimetallic Bonded, Aluminum to Steel \u00bb (r\u00e9vision A, 1977). Elle couvre les joints de transition plaqu\u00e9s par explosion ou par laminage utilis\u00e9s pour souder des structures en aluminium \u00e0 l'acier, comme un roof en aluminium sur un pont en acier.\"}},{\"@type\":\"Question\",\"name\":\"Quelle r\u00e9sistance exige la MIL-J-24445A\u00a0?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Une r\u00e9sistance \u00e0 la traction de la liaison d'au moins 11 000 psi (75,8 MPa) et une r\u00e9sistance au cisaillement d'au moins 8 000 psi (55,2 MPa), y compris apr\u00e8s un cycle de soudage simul\u00e9 de 600 \u00b0F (315 \u00b0C) pendant 15 minutes.\"}},{\"@type\":\"Question\",\"name\":\"La MIL-J-24445A impose-t-elle un contr\u00f4le par ultrasons\u00a0?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oui. 100 % de la surface li\u00e9e de chaque joint est contr\u00f4l\u00e9e par ultrasons, et toute perte totale de l'\u00e9cho de fond \u00e0 la liaison entra\u00eene le refus.\"}},{\"@type\":\"Question\",\"name\":\"La MIL-J-24445A est-elle r\u00e9serv\u00e9e aux navires de l'US Navy\u00a0?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Non. Elle a \u00e9t\u00e9 r\u00e9dig\u00e9e pour l'US Navy, mais les chantiers et soci\u00e9t\u00e9s de classification du monde entier l'utilisent comme r\u00e9f\u00e9rence pour les joints de transition structurels aluminium-acier.\"}},{\"@type\":\"Question\",\"name\":\"Triplate\u00ae est-il conforme \u00e0 la MIL-J-24445A\u00a0?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Oui. Triplate\u00ae satisfait la MIL-J-24445A et est approuv\u00e9 par Lloyd's Register, DNV et ABS.\"}}]}<\/script>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ce qu&rsquo;exige la sp\u00e9cification militaire am\u00e9ricaine MIL-J-24445A des joints de transition aluminium-acier\u00a0: r\u00e9sistance, cycle de soudage, ultrasons, lots et essais de premier article.<\/p>\n","protected":false},"author":3,"featured_media":5729,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[54],"tags":[],"class_list":["post-5738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bibliotheque-technique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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