MIG welding question
 

One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?

MIG welding question
 

On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?

I thought that all Crittall steel windows were hot-dip galvanised.

MIG welding question
 

On 21/10/2020 21:53, newshound wrote:
On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s
steel, Crittall, casements in my house, and the wooden frames they sit
in. The problems are that the windows have leaded lights and haven't
been maintained so many have been nibbled at the bottom by the rust
mouse, which lets-in the rot mouse. I've been getting the steel
sand-blasted to get the paint and rust off, cutting-out the rotten
bits (Rage2 chop saw - brilliant!) and welding-in new sections using a
couple of spare casements for sources of metal. The steel is a
modified H section and about 4mm thick so I'm bevelling the edges to
about 1/2 thickness and doing butt joints, either in-line or mitred at
45 degrees.
The problem is that the steel seems to slightly "run away" at the
edges of the weld, leaving a small pitt. When I look closely while
welding it seems to be generating small balls (not MIG spatter) but
I'm fairly certain it isn't galvanised. Any comments or advice from
experienced MIG welder wielders?

I thought that all Crittall steel windows were hot-dip galvanised.

Correction, I didn't realise they actually started making steel frames
in the 1880s; Wikipedia suggests they started galvanising in 1939
(although I suppose they could have contracted that out).

I'm pretty sure mine are, but that's post WW2.

MIG welding question
 

On Thursday, October 22, 2020 at 9:39:13 AM UTC+13, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?

https://www.weldingmania.com/mig/how-to-avoid-undercut/

MIG welding question
 

On 21/10/2020 21:58, newshound wrote:
On 21/10/2020 21:53, newshound wrote:
On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s
steel, Crittall, casements in my house, and the wooden frames they
sit in. The problems are that the windows have leaded lights and
haven't been maintained so many have been nibbled at the bottom by
the rust mouse, which lets-in the rot mouse. I've been getting the
steel sand-blasted to get the paint and rust off, cutting-out the
rotten bits (Rage2 chop saw - brilliant!) and welding-in new sections
using a couple of spare casements for sources of metal. The steel is
a modified H section and about 4mm thick so I'm bevelling the edges
to about 1/2 thickness and doing butt joints, either in-line or
mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the
edges of the weld, leaving a small pitt. When I look closely while
welding it seems to be generating small balls (not MIG spatter) but
I'm fairly certain it isn't galvanised. Any comments or advice from
experienced MIG welder wielders?

I thought that all Crittall steel windows were hot-dip galvanised.

Correction, I didn't realise they actually started making steel frames
in the 1880s; Wikipedia suggests they started galvanising in 1939
(although I suppose they could have contracted that out).

I'm pretty sure mine are, but that's post WW2.
My house was finished in the late 30s and TBH I thought galvanising
started in the 40s. If they had been galvanised I don't think they would
have rusted as badly as some have.

MIG welding question
 

On 21/10/2020 23:21, Phil wrote:
On Thursday, October 22, 2020 at 9:39:13 AM UTC+13, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?

https://www.weldingmania.com/mig/how-to-avoid-undercut/
Thanks! I've skipped through the article and think that's what I needed.
Now I know it's called "undercut" I can dig more deeply.

MIG welding question
 

Wrote in message:
On 21/10/2020 23:21, Phil wrote:
On Thursday, October 22, 2020 at 9:39:13 AM UTC+13, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?

https://www.weldingmania.com/mig/how-to-avoid-undercut/
Thanks! I've skipped through the article and think that's what I needed.
Now I know it's called "undercut" I can dig more deeply.


Thankyou.

There corrected it for you.
--
Jimk


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

MIG welding question
 

On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?
Without seeing an image its difficult to diagnose but it sounds like you
are either using too much heat or travelling in a straight line too
fast. If galvanise were still present you would get lots of white smoke.

Try using a weaving motion erring towards the thicker metal.

Mike

MIG welding question
 

On 22/10/2020 00:04, wrote:
On 21/10/2020 21:58, newshound wrote:
On 21/10/2020 21:53, newshound wrote:
On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s
steel, Crittall, casements in my house, and the wooden frames they
sit in. The problems are that the windows have leaded lights and
haven't been maintained so many have been nibbled at the bottom by
the rust mouse, which lets-in the rot mouse. I've been getting the
steel sand-blasted to get the paint and rust off, cutting-out the
rotten bits (Rage2 chop saw - brilliant!) and welding-in new
sections using a couple of spare casements for sources of metal. The
steel is a modified H section and about 4mm thick so I'm bevelling
the edges to about 1/2 thickness and doing butt joints, either
in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the
edges of the weld, leaving a small pitt. When I look closely while
welding it seems to be generating small balls (not MIG spatter) but
I'm fairly certain it isn't galvanised. Any comments or advice from
experienced MIG welder wielders?

I thought that all Crittall steel windows were hot-dip galvanised.

Correction, I didn't realise they actually started making steel frames
in the 1880s; Wikipedia suggests they started galvanising in 1939
(although I suppose they could have contracted that out).

I'm pretty sure mine are, but that's post WW2.
My house was finished in the late 30s and TBH I thought galvanising
started in the 40s. If they had been galvanised I don't think they would
have rusted as badly as some have.

I guess that ties up pretty well.

MIG welding question
 

On 24/10/2020 14:37, Muddymike wrote:
On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s
steel, Crittall, casements in my house, and the wooden frames they sit
in. The problems are that the windows have leaded lights and haven't
been maintained so many have been nibbled at the bottom by the rust
mouse, which lets-in the rot mouse. I've been getting the steel
sand-blasted to get the paint and rust off, cutting-out the rotten
bits (Rage2 chop saw - brilliant!) and welding-in new sections using a
couple of spare casements for sources of metal. The steel is a
modified H section and about 4mm thick so I'm bevelling the edges to
about 1/2 thickness and doing butt joints, either in-line or mitred at
45 degrees.
The problem is that the steel seems to slightly "run away" at the
edges of the weld, leaving a small pitt. When I look closely while
welding it seems to be generating small balls (not MIG spatter) but
I'm fairly certain it isn't galvanised. Any comments or advice from
experienced MIG welder wielders?
Without seeing an image its difficult to diagnose but it sounds like you
are either using too much heat or travelling in a straight line too
fast. If galvanise were still present you would get lots of white smoke.

Try using a weaving motion erring towards the thicker metal.

Mike
Yes, since Phil pointed me at the term "undercut" I've been educating
myself and the problem seems to be caused by travelling too fast on too
high a setting. When I tackle the next ones I'll slooow down and use a
lower setting.
I'm fairly sure it isn't galvanised because no popes have been appointed ;-)

MIG welding question
 

Muddymike Wrote in message:
On 21/10/2020 21:39, wrote:
One of my many projects is to restore the (large number of) 1930s steel,
Crittall, casements in my house, and the wooden frames they sit in. The
problems are that the windows have leaded lights and haven't been
maintained so many have been nibbled at the bottom by the rust mouse,
which lets-in the rot mouse. I've been getting the steel sand-blasted to
get the paint and rust off, cutting-out the rotten bits (Rage2 chop saw
- brilliant!) and welding-in new sections using a couple of spare
casements for sources of metal. The steel is a modified H section and
about 4mm thick so I'm bevelling the edges to about 1/2 thickness and
doing butt joints, either in-line or mitred at 45 degrees.
The problem is that the steel seems to slightly "run away" at the edges
of the weld, leaving a small pitt. When I look closely while welding it
seems to be generating small balls (not MIG spatter) but I'm fairly
certain it isn't galvanised. Any comments or advice from experienced MIG
welder wielders?
Without seeing an image its difficult to diagnose but it sounds like you
are either using too much heat or travelling in a straight line too
fast. If galvanise were still present you would get lots of white smoke.

Try using a weaving motion erring towards the thicker metal.

Mike


+1
--
Jimk


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