Can this be welded?

Questions not related to the fuel type, like Manual Gearbox, Body Work, Lights, Interior trim and Seats, Steering, Brakes, Beeping, Wheels and Tyres to be asked in this topic only.

Audio has its own section - see further down the page.

Please provide as much information as you think may be relevant like recent work on the car and you can attach photographs directly to your topic using the form below the text box.
Forum rules
One question per topic.
No Engine questions
Think: Manual Gearbox, Seats, Bodywork, Lighting, Interior, A/C, Heater, Wheels, Steering, Brakes, Tyres and Suspension
My Name: james13579

Member
Posts: 5
Joined: Thu Jul 15, 2021 9:11 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 95000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)

Post

Hi again and thanks so much for the advice.

Unfortunately, I now have a bigger problem. I tried jacking the car up today (placing a piece of wood between the jack and the sill) and the sill snapped away leaving a hole and exposing lots of corrosion.
sill.jpg
Does anyone think this is weldable or should I just take it as the end of the car?

I'm absolutely gutted as I recently spent 4 days changing the clutch on it, full service and new disks/pads! Would love to keep it going but I'm thinking maybe time to cut my losses and let it go.
User avatar
My Name: C3CAR

Guru
Posts: 2659
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 176 times
Been thanked: 93 times

Post

james13579 wrote: Wed Jul 21, 2021 3:37 pm Hi again and thanks so much for the advice.

Unfortunately, I now have a bigger problem. I tried jacking the car up today (placing a piece of wood between the jack and the sill) and the sill snapped away leaving a hole and exposing lots of corrosion.
sill.jpg
Does anyone think this is weldable or should I just take it as the end of the car?

I'm absolutely gutted as I recently spent 4 days changing the clutch on it, full service and new disks/pads! Would love to keep it going but I'm thinking maybe time to cut my losses and let it go.
I am surprised the MOT man didn't fail that.

yes, you can weld sills.

You need to cut away all the rusty stuff and then find a donor sill (from a good C3) and use that to patch it up.

The blue ones tend to rust more than the red ones. So have a look for a red one as a donor. Right up to 2009 will do.

Rusty sills topic, with a youtube video.
My Name: james13579

Member
Posts: 5
Joined: Thu Jul 15, 2021 9:11 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 95000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)

Post

Thanks.

Do you think I could weld a plate over it all the way along - something like in the illustration below?

I only have an arc welder but I'm thinking I could use a 1.5-2mm plate provided the metal I'm welding to is thick enough.

The idea of cutting sills out of another car sounds like a nightmare!
Attachments
sill.jpg
User avatar
My Name: Arfur Dent

Guru
Posts: 3417
Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 307 times
Been thanked: 119 times

Post

You can't weld to rust. You will need to strip back to good metal to find something to weld to. I don't think your patch would hold up to any sort of inspection.

You will have much more rust on the sill than you can see in your picture.
You can add an avatar to your account - Avatar or change your vehicle details - Car Bio or even add a signature to your posts - Signature. But this is not all you can do in the User Control Panel :)
My Name: james13579

Member
Posts: 5
Joined: Thu Jul 15, 2021 9:11 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 95000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)

Post

I'm going to grind all the bad bits off tomorrow and see what's left.

If I do weld in these areas, is there anything plastic or any wiring on the inside that I can't see? When welding a car in these areas before it started smoking from the inside. Got me pretty worried that there would be no way to put out a fire if I couldn't get to it.

(also, just realised that the picture I took had confused me and the plate I drew doesn't really make sense)
User avatar
My Name: Arfur Dent

Guru
Posts: 3417
Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 307 times
Been thanked: 119 times

Post

james13579 wrote: Sat Jul 24, 2021 12:17 pm I'm going to grind all the bad bits off tomorrow and see what's left.

If I do weld in these areas, is there anything plastic or any wiring on the inside that I can't see? When welding a car in these areas before it started smoking from the inside. Got me pretty worried that there would be no way to put out a fire if I couldn't get to it.

(also, just realised that the picture I took had confused me and the plate I drew doesn't really make sense)

It's worth taking the door trim off and lift the carpet with something to protect it from heat. There is some plastic trunking inside the door along the floor, remove that too. Look for wires.

There won't be any wires inside the box section of the sill but you may be burning any paint or coatings inside. Wear a mask.

When welding keep a fire extinguisher near by.

Understand how to extinguish a fire. In an enclosed section, remove the oxygen source or cut off the access to more oxygen to starve the fire.
You can add an avatar to your account - Avatar or change your vehicle details - Car Bio or even add a signature to your posts - Signature. But this is not all you can do in the User Control Panel :)
  • Similar Topics
    Replies
    Views
    Last post