One of the toughest things to do in any engineering is to join materials. The choices have changed over the years, but the basics haven’t; you can use fasteners, you can use adhesives, and you can weld. <\/p>\n
Most people think of welding as something you do on metals, but plastics are welded, certain kinds of rubbers are welded, and some types of glass can be welded.<\/p>\n
Sometimes dissimilar materials can be welded together, sometimes they can only be adhered- case in point, it is possible to silver solder gold to steel (done in fancy firearms inlays all the time) but gold and steel cannot be welded. The solder acts as an adhesive, making a bond with both metals. The greater the delta coefficient of thermal expansion of the materials, the greater the possibility that the joint would fail (this is incidentally why automobile engines with aluminum heads are notorious for losing head gaskets- Aluminum has a coefficient of thermal expansion of 13.7X10^-6 inches per inch per degree farenheit, while the coefficient of thermal expansion for cast iron is around 10.4X10^-6 inches per inch per degree farenheit.(from the materials selectior, Reinhold<\/a>) THe two items expand and contract at different rates, and eventually, scrub the damned gasket right off.)<\/p>\n Anyway- back to joining materials. Most anything that needs to be serviced is joined using fasteners, and the range of fasteners is more huge than it’s ever been. Welding, though, is still a very important solution for a huge variety of reasons. <\/p>\n THe problem is, the very best welds are made while the two pieces to be welded are laying flat. When you’re learning to weld, this is how you learn, with flat pieces. And it’s usually the last time you ever have that luxury.<\/p>\n Welding is such a critical process that the ASME has established standards for the quality of welds, and those standards are damned tough to meet, some requiring years and years of practice. Here’s an example: Welding Positions For Fillet welds: These weld positions are the ones most commonly encountered by field welders, and it is their job to know how to do them and do them properly. Doing these things, especially the overhead (Which is a damned common weld) is, in difficulty, like trying to nail jell-0 to a tree. And guys with little or no education, only experience and practice and an innate ability, do it all the time, every day, all day. <\/p>\n No, welding isn’t a bloody easy thing. Unless you’re doing it on a table. <\/p>\n","protected":false},"excerpt":{"rendered":" One of the toughest things to do in any engineering is to join materials. The choices have changed over the years, but the basics haven’t; you can use fasteners, you can use adhesives, and you can weld. Most people think of welding as something you do on metals, but plastics are welded, certain kinds of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1275","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/neanderpundit.com\/index.php?rest_route=\/wp\/v2\/posts\/1275"}],"collection":[{"href":"https:\/\/neanderpundit.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/neanderpundit.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/neanderpundit.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/neanderpundit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1275"}],"version-history":[{"count":0,"href":"https:\/\/neanderpundit.com\/index.php?rest_route=\/wp\/v2\/posts\/1275\/revisions"}],"wp:attachment":[{"href":"https:\/\/neanderpundit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/neanderpundit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/neanderpundit.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nWelding Positions For Groove welds:-
\nFlat
\nHorizontal
\nVertical Upwards Progression
\nVertical Downwards Progression
\nOverhead
\nPipe Fixed Horizontal
\nPipe Fixed @ 45 degrees Upwards
\nPipe Fixed @ 45 degrees Downwards <\/p>\n
\nFlat (Weld flat joint at 45 degrees)
\nHorizontal
\nHorizontal Rotated
\nVertical Upwards Progression
\nVertical Downwards Progression
\nOverhead
\nPipe Fixed Horizontal <\/p>\n