fa مطالعه ریزساختار و ریزسختی جوش فولاد زنگ نزن 316L جوشکاری شده به روش TIG, A-TIG, FB-TIG تخصصي Special پژوهشي Research <p style="margin: 0px 0px 13px;"><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">در این تحقیق تغییرات عمق&shy; نفوذ و ریزساختار و ریزسختی جوش فولاد زنگ&shy;نزن </span><span dir="LTR" style="margin: 0px; line-height: 150%;">L</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span>316 در سه حالت </span><span dir="LTR" style="margin: 0px; line-height: 150%;">TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span>، </span><span dir="LTR" style="margin: 0px;">A</span><span dir="LTR" style="margin: 0px; line-height: 150%;">-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> و </span><span dir="LTR" style="margin: 0px; line-height: 150%;">FB-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> <span lang="FA" style="margin: 0px;">مطالعه و با یکدیگر مقایسه گردید. پس از انتخاب فلاکس بهینه تأثیر آن بر عمق نفوذ، ریزساختار و میکروسختی جوش فولاد زنگ&shy;نزن </span></span><span dir="LTR" style="margin: 0px;">L</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span>316 جوشکاری شده به روش&shy;های </span><span dir="LTR" style="margin: 0px; line-height: 150%;">A-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">و </span><span dir="LTR" style="margin: 0px; line-height: 150%;">FB-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">بررسی و با نمونه </span><span dir="LTR" style="margin: 0px; line-height: 150%;">TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> مقایسه گردید. مشاهده شد عمق نفوذ و نسبت عمق به عرض در روش </span><span dir="LTR" style="margin: 0px; line-height: 150%;">FB-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">نسبت به دو روش دیگر اندکی بیش&shy;تر است. همچنین در روش </span><span dir="LTR" style="margin: 0px; line-height: 150%;">A-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> در خط مرکزی جوش وسعت دندریت&shy;های هم&shy;محور مرکزی نسبت به روش </span><span dir="LTR" style="margin: 0px; line-height: 150%;">FB-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">کاهش یافته&shy; است.</span><span style="margin: 0px;" dir="LTR"></span><span style="margin: 0px;" dir="LTR"></span><span dir="LTR" lang="FA" style="margin: 0px;"><span style="margin: 0px;" dir="LTR"></span><span style="margin: 0px;" dir="LTR"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">بررسی میکروسختی این سه نمونه نشان داد که سختی خط مرکزی جوش در </span><span dir="LTR" style="margin: 0px; line-height: 150%;">A-TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> </span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: ">و </span><span dir="LTR" style="margin: 0px; line-height: 150%;">FB</span><span dir="LTR" style="margin: 0px;">-</span><span dir="LTR" style="margin: 0px; line-height: 150%;">TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> بیش&shy;تر از</span><span dir="LTR" style="margin: 0px; line-height: 150%;">TIG</span><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span><span b="" font-size:="" lang="FA" style="margin: 0px; line-height: 150%; font-family: "><span style="margin: 0px;" dir="RTL"></span><span style="margin: 0px;" dir="RTL"></span> است.</span><span style="margin: 0px;" dir="LTR"></span></p> <p style="margin: 0px 0px 11px; text-align: justify; line-height: 107%; text-indent: 0cm; unicode-bidi: embed; direction: ltr;"><span style="margin: 0px; line-height: 107%;">In this study the effect of activating fluxes on the penetration depth, microstructure and microhardness of AISI316L austenitic stainless steel were evaluated by three TIG process variations (TIG, A-TIG and FB-TIG) and the results were compared together.. After selecting the optimal flux in the second stage, the effect of that on the </span><span lang="EN" style="margin: 0px; line-height: 107%;">penetration depth</span><span style="margin: 0px; line-height: 107%;">, microstructure and weld microhardness of<span style="margin: 0px;">&nbsp; </span>welded 316L austenitic stainless steel by A&ndash;TIG and FB-TIG methods, were evaluated and<span style="margin: 0px;">&nbsp; </span>the results were compared by the sample which was welded by TIG process.</span><span style="margin: 0px; line-height: 107%; font-family: "> </span><span lang="EN" style="margin: 0px; line-height: 107%;">At this stage, it was found that the depth and width to depth ratio in FB-TIG method is slightly greater than the other two methods. Also in FB-TIG method, eqiaxed dendritic zone in the center line of weld is slightly greater than in A-TIG method. Study of microhardness of weld in three methods shows that in A-TIG and FB-TIG methods hardness of center line is more than TIG method.</span><span style="margin: 0px; line-height: 107%;"></span></p> فولاد زنگ نزن 316, A-TIG, FB-TIG, عمق نفوذ, ریزساختار, میکروسختی 316L austenitic stainless steel, A-TIG, FB-TIG, penetration depth, microstructure, microhardness 39 50 http://jwsti.iut.ac.ir/browse.php?a_code=A-10-207-1&slc_lang=fa&sid=1 N. Rahimi نگار رحیمی No دانشکده مهندسی مواد - دانشگاه صنعتی سهند T. Saed توحید سعید saeid@sut.ac.ir Yes دانشکده مهندسی مواد - دانشگاه صنعتی سهند