{"id":105,"date":"2017-04-26T20:16:03","date_gmt":"2017-04-26T20:16:03","guid":{"rendered":"http:\/\/weldnotes.com\/?p=105"},"modified":"2017-04-26T20:19:01","modified_gmt":"2017-04-26T20:19:01","slug":"what-is-mig-welding","status":"publish","type":"post","link":"http:\/\/weldnotes.com\/?p=105","title":{"rendered":"What is MIG Welding?"},"content":{"rendered":"<div class=\"video-container\"><iframe loading=\"lazy\" title=\"What is MIG Welding? (GMAW)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/twUAa5LWUvk?feature=oembed&#038;wmode=opaque\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Transcript:<\/p>\n<p>What is MIG welding?<\/p>\n<p>Mig stands for Metal inert gas welding. \u00a0The American welding society calls this process \u201cGas Metal Arc Welding\u201d or GMAW. \u00a0\u00a0You might also hear it called \u201cwire welding.\u201d<\/p>\n<p>In Mig welding a thin wire acts as the electrode. \u00a0\u00a0This wire is fed from a spool mounted on or inside the welding machine through a flexible tube and out of the nozzle on the welding gun or torch. \u00a0The wire is fed continuously when the trigger on the welding gun is pulled. \u00a0When the trigger is pulled, it also switches on the welding current and a \u201cshielding gas.\u201d<\/p>\n<p>An electric arc forms between this wire electrode and the workpiece and heats both metals above their melting point. \u00a0These metals mix together or \u201ccoalesce\u201d and solidify to join the workpieces together (or into a single piece). \u00a0The metal in the parts to be joined is called the \u201cbase metal\u201d and the metal that comes from the melting wire electrode is called \u201cfiller metal.\u201d \u00a0\u00a0Because the wire electrode melts as it is being used, the MIG wire is a \u201cconsumable electrode.\u201d \u00a0\u00a0\u00a0MIG welding always adds filler metal to the joint.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-109\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6-300x170.png\" alt=\"\" width=\"300\" height=\"170\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6-300x170.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6-768x435.png 768w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6-1024x580.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/MIG6.png 1408w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Here is the MIG wire being fed through the wire feeder into the flexible tube or \u201cconduit liner\u201d \u00a0\u00a0The liner goes through the hose or \u201cwelding lead\u201d all the way to the torch nozzle. \u00a0\u00a0At the nozzle, the wire is fed through a \u201ccontact tip\u201d and comes out at the point of the weld.<\/p>\n<p><i>Shielding gas<\/i> is also fed through the welding lead. \u00a0It goes a through a gas diffuser and flows out through the nozzle. \u00a0This shielding gas, which is often a mix of Argon and CO2 protects the molten metal from reacting with oxygen, water vapor, and other things in the atmosphere.<\/p>\n<p>The shielding gas is stored in high pressure cylinders like these. \u00a0\u00a0\u00a0The pressure is reduced to a usable level by a device called a \u201cregulator.\u201d<\/p>\n<p>In MIG welding, all of the machine controls are set on the machine itself. \u00a0The most important of these are polarity, wire speed and voltage. \u00a0The trigger on the gun is just and on\/off switch. \u00a0For most MIG welding, the current is Direct Current or DC. \u00a0DC is like the current flowing from a car battery. \u00a0One wire is always the negative and one is always the positive. \u00a0In DC MIG welding, the electrode is usually positive, and the workpiece is negative. \u00a0The term DCEP is used, \u00a0indicating that the current is \u00a0DC, and the \u00a0electrode is positive. \u00a0\u00a0This is also called \u201creverse polarity,\u201d but DCEP is a more descriptive term.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-110\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9-300x188.png\" alt=\"\" width=\"300\" height=\"188\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9-300x188.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9-768x480.png 768w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9-1024x641.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig9.png 1389w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>In an electric circuit the current flows in a loop. In MIG welding, \u00a0the current has to flow in a complete circle from the machine, to the torch, into the work, and back to the machine. \u00a0A work lead is clamped to the work to complete the circuit from the workpiece back to the machine.<\/p>\n<p>So in summary,MIG Welding is an electric arc welding process. \u00a0It uses a consumable wire electrode. \u00a0Filler metal is added automatically, and the shielding gas comes from a high pressure cylinder.<\/p>\n<p><a href=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-112\" src=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok-300x201.png\" alt=\"\" width=\"300\" height=\"201\" srcset=\"http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok-300x201.png 300w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok-768x515.png 768w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok-1024x686.png 1024w, http:\/\/weldnotes.com\/wp-content\/uploads\/2017\/04\/Mig-ok.png 1362w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Transcript: What is MIG welding? Mig stands for Metal inert gas welding. \u00a0The American welding society calls this process \u201cGas Metal Arc Welding\u201d or GMAW. \u00a0\u00a0You might also hear it called \u201cwire welding.\u201d In&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":106,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,20],"tags":[21,22,23],"class_list":["post-105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manufacturing-processes","category-welding","tag-gmaw","tag-mig","tag-welding"],"_links":{"self":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=105"}],"version-history":[{"count":3,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions"}],"predecessor-version":[{"id":113,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/posts\/105\/revisions\/113"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=\/wp\/v2\/media\/106"}],"wp:attachment":[{"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=105"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=105"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/weldnotes.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}