How to Read Welding Symbols: Part 1of 3

hey guys welcome back to well calm so we've had a lot of requests it's a highly requested topic we've had a lot of DMS emails comments in our comments section just overwhelming responses we put out a video a couple weeks ago we showed a welding symbol and people said hey can you do more videos on welding symbols so we're gonna start incorporating those into every lesson but I think it'd be a good idea to make a full video about welding symbols so because of the amount of information we're getting to break it up into a little series so let's talk about exactly what a welding symbol is okay it's basically a symbol that you're gonna find on your blueprints or shop drawings and it's going to tell you how to make a specific weld in a specific spot what size it should be how long it should be depth joint preparation all kinds of stuff so two things I highly recommend you guys go out and throw in your library is the AWS a 3.0 standard welding terms and definitions and then the other one is the a 2.4 standard symbols for welding brazing and non-destructive examination so these are two books I mean they're they're just worth their weight in gold very good information in both of these books reference them from time to time out on the job site or you know if I have to do stuff in the office I reference this information all the time so it's more than paid for itself go ahead and pick them up another thing another great resource you guys can get is the camera man I'll put a link in the description there is like a cheat sheet or a quick study guide I don't have mine with me but you can pick those up the relatively cheap get online and it's just like a quick little card that you can kind of refer back to for all the information we're going to discuss today and the additional episodes so let's go ahead and we're gonna get into it we're gonna first break down exactly what a welding symbol is and how to read them okay welding symbols are nothing more than modern-day hieroglyphics okay it's a picture that's gonna give us a bunch of information about what we have to weld how we're gonna weld it sometimes the process is listed in there the size of the weld is going to be listed depth of fusion joint preparation all kinds of good information right so the first thing we want to talk about is this horizontal line this is called a reference line this is where all your information is going to stem from okay and then we have what's called the arrow line that's going to point directly to the you're supposed to be working on our you're gonna make wherever you're going to make that welt and it doesn't matter which side that that line points to okay you can point left right but regardless you're always going to read the welding symbols from left to right so if I have the information here it's always going to go from left to right left to right on both of these now sometimes we have a tail and the tail is used to give us additional information additional things that aren't found on the welding symbol they don't have a weld symbol for it or supplementary symbol for it such as process or specific preparation or when we get into talking about back welds and backing welds because it's pretty much the same symbol they're gonna go ahead and list it in that tail the information that they don't actually have a symbol for okay so now that we have this right here let's talk about the sides okay always this is going to be always the arrow side and this up here is always going to be other side okay so it doesn't matter which way the arrow is pointing always the top is always going to be other side and the bottom is always going to be arrow side so this is called a welding symbol these right here are weld symbols okay and these are my groove weld symbols and these are additional symbols right here so I have Phillip plug tslot stud spotter projection seam back or backing surface and edge okay so these are all the grooves that can be made and these are all the additional welds that can be made so let's go ahead and we'll practice we'll just go through a basic fill it weld and then I'll show you where arrow side and other side kind of originate and then how to how to measure these out as far as length so you can take the information conveyed on the welding symbol and put it into your put it into your work so remember this whole setup here is the welding symbol and these right here are the weld symbols okay and that's specified in those two documents that I was telling you about okay so here's five different types of joint configurations we're gonna go ahead and kind of walk you through the process of arrow side other side because it can get pretty confusing really quick always remember that the information on the bottom is going to apply to arrow side information it's going to go on the other side is always going to be on the top so other and this is arrow okay so this right here would be the arrow side and this one is the other side okay get on the joint number two arrow side other side same thing common T joint right have the arrow arrows pointing down here so we have arrow side other side again same thing and again here arrow side other side okay so let's go ahead and we'll walk through let's talk about different welding symbols so this right here would be a butt joint okay the two pieces are butted together doesn't look like there's any preparation here but let's just walk through a simple set up that's the typical single V joint configuration now arrow is pointing to this this weld is going to occur on the arrow side okay so that means my joint preparation is going to take place right here okay so that's when you would see that that type of information so now let's get into this side right here let's do a groove weld on one side and a fill it on the other okay so this is a single single bevel v group on the arrow side and it's symbol for a Filat weld on the top okay so the Filat weld is going to go on the other side and the single bevel v is going to go on the arrow side so this is what that weld would look like okay so now I have a groove weld over here and a fill it weld on this side down here what if I wanted to fill a weld on both sides just like that that's gonna tell me that I need one filler weld it here on the arrow side one fill it weld on the other side and we'll get into dimensioning these here in a minute same thing with this lap joint over here we have arrow side other side let's go ahead we'll just put one filler weld in on the other side so you guessed it it's gonna go on the top because the top of the reference line is our other side and then we'll put that fill a 12 in here now this piece right here is kind of interesting this is a edge joint so we're just going to weld right along top of the edge and that's what this symbol looks like right here okay so we're just gonna we'll put a weld right up in this area so as you can kind of already tell the symbol kind of you know signifies or represents and looks like what we're trying to achieve so right here I have a double or a single V and it's going to go right in here okay and it looks like that single V down here I have a Philip weld fill it well typically looks when it's done correctly very similar to a triangle okay and then my single single bevel over here it's just one single bevel remember I have a straight vertical leg the vertical leg is always going to go on the left hand side of the weld symbol so any weld symbols where you have a vertical line it's always gonna go to the left okay so here's my my flat piece and this is the part to get the preparation okay same thing fill it well just to triangles and that's what it looks like here just two triangles same thing up here a triangle and now the edge joint just two pieces butted together so it looks like a butt joint with the two vertical lines okay let's go ahead I'll draw another another sketch out here we'll start talking about dimensioning okay so let's just do a standard T joint everybody's familiar with a T joint especially you guys in school you're probably welding the heck out of them things right now okay so right here is just a standard T joint let's go ahead and draw a weld symbol for it we'll talk about what it means okay what size fill a while gonna go on that's right other side so it's going to go over on this side then how do we know how big the what to put this so let's say we have 3/8 material and they're gonna call out for a 3/8 Filat weld the size of your Filat weld is always going to go on the left-hand side so remember earlier when I said we always read from left to right it's gonna be the same thing other side 3/8 fill it weld okay so both of these symbols are telling me the same thing even though one's drawn with the arrow to the left one's drawn with the arrow to the right so what would that look like just like this and that would tell me that dimension from right here at the root to the top or the toe of that that Filat weld should be 3/8 of an inch now how long should I make this okay that's the notice thing we have to think about how long is this welds gonna be well if there's no information to the right hand side that means I'm gonna weld that joint out the full full seam okay so let's draw an overhead view okay now this view this is the bird's-eye view looking looking top-down we're looking at this piece of material okay so this right here symbolizes this this member turnt the opposite way and this is going to be the vertical plate for the T joint so if I flip this up on end and spun it back that way this is gonna be the bottom plate laying flat and this is our vertical plate laying up let's say I needed this was a 10-inch piece and I needed to put a 10-inch Filat weld in there how would I do that the length is always going to be to the right of that filler weld symbol so the size of the weld and the length of the weld okay let's say this is a 10 inch piece but I only wanted to weld up let's say eight inches of it that symbol would be right there okay so we have a 3/8 fill a 12-8 inches long over the span of a 10-inch piece all right so you notice when I drew this I put the 8 inch weld in the center so let me show you exactly what that would look like so right here we would have some dimensioning lines this would be a 1 inch difference on either side and in the middle here is where I'm gonna have my weld symbol okay we would put that on this welds occurring on the other side so we'll put that filler weld there remember it's three eighths of an inch fill it weld we're gonna say eight inches okay so that way you would know that this weld is actually gonna sit on the center so we have a 8 inch weld if 10 inches overall the difference between that there's 2 inches 1 inch on either side so you're gonna step in 1 inch make your 8 8 inch weld and then stop make sure you fill into the entire cross section of that weld because that is where the the CW is gonna come and inspect your work that's where he's gonna measure - he's gonna measure at your crater your crater needs to be 3/8 of an inch because if it's anything less right he has to go by that the weakest the weakest link in the chain so if you have let's say a 3/16 well because that crater is not completely filled in he's gonna mark this whole thing as a 3/16 weld and it's gonna be under sized so you need to make sure that you write that to the complete size that it's supposed to be all right let's try something a little bit more complicated all right let's try something a little bit more difficult so here I have three pieces we're gonna put four different size fill it welds on here so on one side I'm gonna have a 3/8 the other side I'm gonna have a 5/16 and then over here we're gonna have quarter inch and 3/16 so exactly where would these welds go which weld size would go where I'm go ahead and give you a second to figure that out all right now we're back so 3/8 on the other side other side in this case isn't going to be over here it's going to be here because remember I'm pointing at this joint I'm not going to cross this member here I'm gonna cross over on this side okay so up here I'm going to have 3/8 fill it well and on this bottom one here we're gonna have five sixteen now what about over here three sixteenths to the arrow side and then quarter inch to the other side okay so remember other side because my arrow is pointing right here I'm gonna have other side arrow side for my five sixteenths now over here arrow side is going to be three sixteenths while the other side is one quarter of an inch let's go ahead and move on to intermittent fil-a twelves alright so let's talk about intermittent Phila twelves alright so let's look at a tea joint in overhead view or plan views is called as I'm looking down on it okay and I want to make a intermittent filler weld okay so I'm gonna put it on the arrow side right and let's make a quarter-inch weld we're gonna space these out to one six you know when we talk about weld spacing it's always gonna be written like this so this number right here the two that's gonna be the length of our weld and then the whatever digit is on the right-hand side after the - that is going to be the spacing of the welds now the spacing of the welds always goes from Center to Center it doesn't go from start to start and and it's always Center to Center that's how they're gonna measure it okay so what exactly does that mean that means we're gonna have two inch welds every six inches on center so we'll go ahead and mention these two inches here two inches here two inches here but from Center to Center we're gonna have six inches in between now this is welded only on one side so now what if we have intermittent filler welds on both sides of the material once again we're still in the overhead view but now the welding symbol is about to change a little bit okay let's go ahead and just for just for you know building a little bit more confidence let's go ahead and do quarter inch up on this side three-eighths on this side okay for some reason the engineer wants different Wells of different places so 3/8 arrow side is gonna go down here and then the quarter inch would go on the other side which is the top okay so same thing two inch weld every six inches but we're gonna go on both sides that's where our walls are going to be placed and again two inch welds and they're going to be six inches now again we want to be careful with this because our crater we need to make sure that our craters are filled in to the complete cross-section so that the welds are quarter inch in our crater and three-eighths and the arrow side crater you want to make sure to fill those completely in otherwise if it's too small that welded area right there the inspectors is gonna come in and check your work he's gonna have to go off of that weld so if you put if you have a full 3/8 weld all the way across here but in your crater you're down to a quarter of an inch he's gonna mark that down as a quarter of an inch for that entire weld you're gonna have to redo it your get to add more weld to it okay so try to get it right the first time I always recommend if you're a welder learn how to measure your own welds and get the tools to do it you can pick up a cheap set of filler weld inspection gauges I'd go with gal you can get those on Amazon you can get them at your local welding supply store but get those to make sure you're hitting the appropriate size so when the the inspector comes over and checks it out you know you don't have to go back and redo your work you already know now if he calls it something different than what you assumed it to be don't argue with him just go back and fix it okay so let's get rid of these we've got one more type of intermittent filler weld I don't want to talk to you guys about standard t-joint and the overhead view will mix it up a little bit come down here remember we have our air line and we're gonna do two types of Filat welds now see how these Filat welds are offset that tells me that the welds are gonna be offset in the spacing we'll do two on six again and we'll do let's say 5/16 welds remember leg size or weld size is gonna go on the Left length and pitch is gonna go to the right if there is no pitch if that other digit isn't there that's the size that's the length of the weld that you're gonna be putting in there okay and all your prints should be in 1:1 dimensioning factor or the other so they're either gonna be Imperial or they're gonna be metric or you know whatever the case may be that should be standard throughout the entire set of prints you shouldn't have everything drawn out in standard form and then you know all your measurements in in metric okay it's and that's not gonna happen it's not standard it's not how it's supposed to be done okay so let's go ahead and draw this out okay again these are going to be two inch welds and it's gonna be every six inches okay so now on the backside we're gonna be opposite okay so all the welds are still two inches and then we're gonna have six inch centers same thing here we're gonna have six inches in between our two wells so remember intermittent Filat welds gonna be one right over top of the other and that tells me that they're gonna go one on side one on either side okay and then we have the intermittent or I'm sorry the staggered intermittent the symbols are gonna be offset so any times those symbols are offset that's going to tell me that the welds are also going to be offset one on top of the other they're just gonna be equal they're gonna be on opposite sides okay so that pretty much covers all your different instances where you would run into intermittent fellow welds all right homework time if you guys want a free slap for your hard hat or your welding hood go ahead and take a picture of the last filler well do you guys did go ahead to mention it out curricula correctly and put it up on Instagram using hashtag well comm symbols or put it up in the Facebook page we'll go ahead if you're correct we're gonna go ahead and we're gonna mail you out of sticker so right now I have to go eat crow in other words man cub won the hurricane challenge so now I got a spring for lunch so we're gonna go ahead we're gonna head out to lunch I'm gonna get a Miss chocolate shake he's been whining about and then stay tuned for part two where we talk about groove welds okay make sure you hit that subscribe button in that notification bell that way you're notified when we release our next episode til time make every well better in your last all right let's go man of my word I owe this man some food so we're gonna go in here get our grub on I'm going to do two baking smash with pretzels with the pretzel bun one I'm gonna get drinks and smash fries and a diet coke one it's gonna be a salted caramel shake shake know it for you buddy good yeah hope you're enjoying that the burger there Mike first and last time you ever beat me on the next one all right gotcha

Channel: Weld.com

Views: 220,435

Rating: 4.9570098 out of 5

Keywords: welding, weld.com, mig monday, tig time, how to weld, learn how to weld, welding symbols, welding symbol, welding inspection, welding inspector, weld joints, fillet weld, mechanical engineering, cwi exam, weld symbols, how to read a blueprint, how to read a weld symbol, weld symbol, weld fabrication, welding terms, welding blueprint reading, welding symbols in drawing, fillet weld symbols, welding symbols on blueprints, weld symbols explained

Id: Svoi1v_o5yI

Length: 20min 27sec (1227 seconds)

Published: Mon Sep 23 2019

Reddit Comments

[u/VibeGT]

Most painful part of school imo, I know what I’m looking at but I still can’t actually write my own unless I’ve got a key in front of me

[u/lennoxx486]

The design engineers at my work need this

[u/innocuous__]

Great watch, helped me heaps

[u/OldDog03]

At one time I used to know all of these, 30 plus years ago. If you do not use it you lose it. Like a lot of things it's repetitive and relearn quickly.

[u/Zirator]

Remarkable that even the basic use of arrow side and other side is exactly opposite to the European standards that define welding symbols. For me arrow side is above the line and other side is below the line.

[u/vanquish28]

Part 2: https://youtu.be/XD6PhN_mTgE

[u/WeldingEmpire_com]

I have been welding for 19 years and I still see some weird new symbol I have to check on.