IS IT CAST IRON OR CAST STEEL? 5 Ways To identify Before Welding

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good afternoon YouTube I recently did a

video titled TIG welding cast-iron I'll

put a link to it up above here in that

video we repaired a broken cast iron

handle if you've been following along

with that series we keep repairing that

pan and we're doing it with different

processes in different filler metals but

within that video above I also discussed

five different ways that you can tell or

determine if a part is cast iron or cast

steel well I think that that's a pretty

important topic so I wanted it to be its

own video so what we're talking about

today five different ways that you can

tell if a part is cast-iron now I am NOT

an expert in cast iron there's all kinds

of different cast irons out there many

of you I'm sure are much smarter than me

about cast iron these are just some of

the things that I found that worked for

me here's a clip from that video guys I

hope you enjoy it






yeah we did it in order to determine how

you're gonna repair this you've got to

figure it out what it is you're working

with there are five ways to determine

what this material is the first one

we're gonna cover it was easy it said

right on the label what it was he said

it was cast-iron but if the part doesn't

say cast-iron on it you're gonna have to

figure it out yourself

the second way of determining it if is

if it's broken you can look at the grain

structure so you take a look at that

grain structure it's probably gray cast

iron is what I'm guessing that's the

most common and here's a look at the

handle piece let's compare that to what

basic steel would look like now here I

have a piece of steel that I just bent

back and forth

eventually until it failed now you can

see how the grain structure on the steel

looks nothing like the grain structure

on the cast iron the third method is

gonna be a spark test I'm gonna start

out by grinding here what I want you to

do is watch the color in the shape of

the sparks you'll see that on cast iron

that the color tends to be the brightest

at the end of the spark and then I'm

gonna grind my steel table here and

you'll see that it's bright orange in

the sparks developed right basically at

the grinding wheel and they extend out

if you're trying to determine if your

part is cast iron or cast steel here's a

great example cast steel will look like

this the same as mild steel the sparks

originate at the abrasive disc and work

outwards versus cast iron they seem to

originate outwards your part is cast

iron or steel is to drill it drilling

cast iron looks completely different

than drilling cast steel let's take a

look as you can see we have a long crack

that extends the length of this we have

to stop drill this to prevent this crack

from continuing on if you just weld this

up this crack will continue to migrate


take a look at that it's more of a

filing than a chip very short almost

looks graphite II very different than

than a steel chip let's drill some steel

and compare it so here is our mild steel

and this is the material that it removed

from it you can see that bright and

shiny curlicues they look nothing like

the powdered dust that came out of that

holes and the fifth and final test is

called a file test you can do is you're

going to take a file and just run it on

the edge of your of your material piece

that bit right in that's doing a nice

job of filing yep that's cutting cutting

right in as it should now my next step

is to put a blast tack I'm at about a

hundred and fifty amps right on the

corner there

now if this is cast-iron this file will

skate right across that because the heat

will cause the metal in the cast iron to

Harden skating right across it's not

even touching it just like a ball baron

look at it not even touching so I feel

pretty confident that the five tests

that we just talked about have

determined this to be cast iron but for

those of you that don't believe any of

these tests feel free to write down into

the comments section that it is

absolutely without a doubt Castile those

new pans are all cast steel it's the

older stuff that was cast iron your

spark test was wrong by uncle Skeeter

welded this once with MIG wire it has to

be cast steel if you do your test and it

turns out to be that it's cast steel you

just repair it just like you would mild

steel or anything else you don't have to

do anything fancy don't have to do

preheat post heat or any of that stuff

so if you guys want to know more about

cast iron welding or different processes

I've got a series that I've started

doing all different processes with some

with pre heat some without pre heat some

with post heat some without I'm with

control cooled down we've got TIG MIG

stick nickel rods 7018 bare MIG wire you

name it we've got it in that series so

I'll put a link up above here for that

and I'll put one down below I want to

thank you guys for watching thank you

guys for tuning in until next week stay

safe everyone have a good day oh and if

you guys want to find out what I'm

working on before it even makes it up to

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have a good day see ya