Fillet weld information

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hey guys in this lecture what I'd like

to do is show you what a fill weld is

some of the places they might be placed

we're gonna get into the parts of the

filler weld and we're also going to get

into a little bit of sizing and

measuring of filler welds so let's get

right into it what is a filler well well

a fillip weld is something or a weld

that is placed in a 90 degree or right

angle joint so let me show you what a 90

degree right angle joint would look like

so this is a typical T joint right here

I'm gonna have it go down so this would

be your your ninety degrees so right

here ninety degrees or right angle so

the weld will be placed roughly like

this and it's kind of supposed to be a

triangular shape sometimes it's a little

bit more of a domed up cover to it so

let's go over every where a right angle

joint is alright so these are our joints

in question I'm going to use a red pen

and I'm gonna mark where the welds will

be put on these particular joints now

the first one which we've been shown you

in that opening scene this one is a t

joint now T joints are by far the most

popular fill it well you're gonna be

doing it's the one you're gonna be doing

in this module so you're gonna get used

to this one so what will happen is we're

gonna do a fill at wealth and was gonna

look something like this right there now

on our joints we're gonna do both sides

but in reality you don't always have to

do both sides and you're gonna we're

gonna do welding symbols here in a

little while

and we're going to show you which side

and stuff like that things will be going

now this one over here so remember T

joint this one over here is called a lap

joint now a lap joint is just two pieces

of metal and you're actually welding

your Phillip welds right here either one

and again not both both sides don't have

to be done for it to be considered a lap

joint but in this instance I wanted to

show you both of them so lap joints are

also pretty popular we also have open

corners now an open corner is going to

have a Phillip weld that is going to go

like this or it could potentially have a


we'll have one on the inside to open

corners are probably the least popular

you're gonna get a lot of tea joints a

few lap welds and then a few very few

open corners we're gonna probably do a

couple here I know in the tig class we

do some open corners but there's not a

heck of a lot of these out there so

let's go ahead and I want to talk about

the parts of the weld on a tea joint

because that's what we're gonna be

working with the most okay so what I've

done is I have a 90 degree joint here

and I didn't draw all the extra lines

because I'm gonna be adding a lot to

this and I wanted to try to keep this

clean as possible I have added a weld in

here so this area inside here is my weld


what we're gonna do is I want to talk

about some of the parts of a weld so I'm

just going to go through them and we're

going to talk about what each one does

and maybe a little bit about that you

know not everything has an actual use I

guess so the first one I like to start

with is right here we are and right up

here we're gonna have the toe of our

weld every weld has a toe it's a place

where our weld metal actually meets the

base metal now when we're getting our

toe we want to make sure that it's a

nice clean transition from the base

metal into our wealth what happens is if

that's a really abrupt hard edge that's

considered a stress riser and it will

call it it'd be more likely to have a

crack or somewhere go on right there

than anywhere else so we want to try to

make that a nice transition okay so we

got our toe the next thing we have is I

like to talk about the route next so

we're gonna go ahead and we'll just draw

a line and we'll put the route right

here now the route is where the actual

two pieces of base metal meet up that

that joint is actually going to get

penetration it's all gonna happen right

here now one of the interesting things

is if we had a weld we're gonna have it

and let's let's go ahead and pretend

what's happening inside of that metal

okay now penetration happens right here

at the root

outside here is all fusion okay so this

weld is actually melting all of this

area around here and turning this weld

into one piece with the base metal so

when they talk about 100 percent

penetration they are pretty much talking

about the route while around is all

fusion okay

now that becomes very important because

100 percent penetration there's a lot of

other things we need to do with route

design things like that we're not going

to get into it very much with filler

Wells because most the time when you're

doing 100 percent penetration whoa is

happening to a be groove or a butt joint

it is possible to get a hundred percent

penetration but we have to do some

beveling to that vertical plate we'll

get into that possibly in a later class

but right now we'll just focus in on the

parts all right so the next thing we

have here is we have our face so we'll

go ahead and and this is anywhere that

you can see the weld is considered a

face our face a face can be either

concave or convex now we're gonna get

into this a little bit more when we

start talking about weld symbols but if

it was to be a convex it would actually

be really big out here okay I don't know

if that makes sense to you guys that it

would be a really crowny well with the

convex concave Don the other hand would

be one that was really kind of inward

now this becomes very important when

we're measuring welds or we're trying to

figure out how strong a weld is because

there's another part which I want to

point out right now is called the throat

and that's going to be from our route up

to here or up to our face is called the

throat now the throat is actually

there's actually a few different types

of throats

there's our theoretic throat and then

there's the actual throat now the actual

throat will be from this face to the

root while the theoretic throat will be

a straight line from the toe to the

other toe now

this becomes interesting if you have a

convex well that toe our that throat

actually gets moved in quite a bit so

let me grab on a straight edge and I'll

show you so as you can see we have our

our dotted line here that would be for a

concave dwelled so what would happen is

if we did a straight line all the way

from one toe to the other there would

actually be metal missing so we can't go

above where that root that face is so

that actually would be here to here so

there would be a line that we draw that

would go across from here to here and

now our new theoretical throat would be

from here to here which would be much

smaller even though the toes are way out

here it would be much smaller so the

theoretical throat is a lot smaller the

actual throat on this particular well a

concave wealth would be the same as a

theoretical throat but it really becomes

important when we're doing a convex

remember convexed has that really crowny

shape to it because even though if

there's a lot of reinforcement weld out

on this end we are still measuring

straight across from the toe to toe so

the theoretical throat of say this this

red line here would actually be about

right here which might be you know a

milk you know maybe a sixteenth or an

eighth inch bigger depending on how

crowny that throat is especially for

this dotted line we drew out here it'd

be a lot of difference let me go ahead

and I'm going to clean this up and then

we'll get to the last few parts all

right now I got it cleaned up so the

last thing that I want to point out is

called the leg of a well so the leg of a

weld starts at the root and goes to the

toe it would be leg now there's two legs

on every weld or every fill it well

there's two legs and that one's gonna be

going up right right here so every weld

is measured off of the leg length that

is unless it's convex or concave and

then we have to go and we're going to

work on we're going to be measuring

based off of that throat length you can

see if we had a like I said a very

crowny crowny weld what we'll end up

having to do is we'll figure out what

the theoretical

throw it is of it and that would tell us

how strong the weld is more than likely

if you get a serious crown to a weld or

really convex that's never gonna pass a

visual inspection so you're gonna have a

lot of problems there you're gonna have

a really hard to so there's gonna be

stress risers things like that so we're

going to be trying to keep that as

limited as possible to putting too much

convex to a well we are gonna have a

nice profile to all of our welds where

it's a little bit domed out rather than

you know pushed in for a concave defect

so or we're gonna try to hit this most

or as close to flat as possible so what

I'm gonna do now is I want to start

talking about measuring a weld like I

said to measure a weld we're gonna be

basing it off of our leg length but

there's a thing called weld gauges so a

weld gauge and I'm going to draw it up

here first and then I'm actually gonna

put it onto some welds I'm going to show

you what that looks like so well gauge

is actually a pretty simple go or no-go

taught style gauge so the gauge usually

looks something like this come out here

and what happens is the measurement from

here up to here will be of that weld

size so if it was a half-inch from here

you know from here over to here will be

1/2 of an inch

that would mean that this Lake length

right here is 1/2 of an inch

now there's also a knot that's usually

right about here and that would be the

same measurement except it's basing it

from here over about half an inch okay

so this this top mark right here or this

top corner is makes basing that half

inch while this notch right here is

telling us if our lower Lake is a half

inch because we want to have for the

most part equal legs there are some

situations where we're gonna have an

unequal leg length and we're gonna show

you that in our symbol section we're

talking a little bit more about that but

for the most part we're gonna have equal

leg lengths so always when we're using a

weld gauge we're checking for the half

inch and the other 1/2 inch so let's go

ahead and I want to show you that on an

actual weld all right so I've gotta say

that weld gauges here and they're it's a

set of them there

all together they're just bolted on I'm

gonna pull them apart I want to show you

some stuff on the well gauges and then

we're gonna take some of these t joints

and I want to show you how you actually

measure a well alright so we got I went

ahead and grabbed the quarter inch well

gauge you can see that says quarter inch

right here you can see this line going

down should be lined up with the bottom

toe of our filled weld while this top

corner should be lined up with the top

edge of our fill at well now I want to

point out these these little marks or

these little tabs on some of these now

these are used to measure the actual

throat of a weld now this woman be set

up for the five eighths but if I was to

put it up there and that didn't touch

the weld that would mean that it's

actually a concave dwelled and we would

need to either replace it or fix it or

whatever they decided so that's kind of

the main purpose of these these gauges

let's go ahead and put it on to a

quarter inch bead and I'll show you that

so you can see the line going down is

probably a little bit shy like we

probably could have welded this one a

little bit bigger and you can also see

if you look at where the top is lined up

at I don't know if you can gain can see

it the top is also a little bit low too

so this passes would be considered an

undersized weld alright so this is our

half inch bead let's go ahead and we can

put our gauge on it and you can see that

it actually comes up pretty dang close

to that line and you can also see this

top edge can't actually make contact

with the top plate without being pushed

up a little bit so that's just about

perfect nothing nothing is dead on but

that's that's pretty getting close to

perfect right there

well I hope this helped you guys out

with some fill weld information sizing

parts of a filler weld and then just

different types of filler welds out

there if you have any questions or

anything I can help you with please let

me know