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Questions tagged [welding]

Process for fusing metals.

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What will happen if you attach the negative pole of welder to the rotor of the motor or the body , will that cause problem?

I have built a machine that rotates a cylinder to weld it, I have to attache a negative pole to the cylinder which is connected directly to the rotor of motor, the motor is controled by a vfd , will ...
Alyamin Smail's user avatar
0 votes
0 answers
126 views

Why are my resistance spot welds not holding?

My core support frame got hit & broke many of top factory spot welds. I have Chicago Electric spot welder but my welds are not holding. Rather then mess up the car further I'm now doing test welds ...
grimview's user avatar
2 votes
0 answers
349 views

What is the best way to go with quarter panel repair?

I’m working on my first DIY car restoration project. Of course the car had a lot of rust spots I needed to fix. After a lot of practice and learning, I started with floor panels and underbody repairs ...
Jan Imrich's user avatar
2 votes
4 answers
3k views

MOT work (is this vehicle in need of welding?)

I really need to find a cheap van. I don't intend to do many miles per year but it will need to be road-legal. I found a van near me and it is cheap enough, but it failed the MOT on the things in ...
DaveGold's user avatar
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3 votes
3 answers
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Is it possible to weld a broken 3/8 extension bar and reuse it?

I broke a 3/8 extension bar while I was undoing a bolt. It broke into 2 pieces (2 blue lines) from the red line I drew in the following picture: Is it possible to weld the 2 pieces together? Will it ...
LFY MP7.3's user avatar
  • 968
1 vote
1 answer
175 views

How would you approach fixing this panel part?

This is a continuation of this saga. I just removed my rear window and grinded down the fix area, finally past the point of no return. Found out that I was scammed by the body worker worst than I ...
IanC's user avatar
  • 386
0 votes
1 answer
424 views

would you use a cheap 70 amp stick welder for an exhaust pipe?

I've never welded before but how hard can it be right. You cut the old pipe out, go down to AutoZone and get yourself a new pipe and some adapters, tac it in place and then weld it all together. Easy, ...
user875234's user avatar
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82 views

What's the right way to weld patches in the joining of panels?

I have a body work job on my car's roof panel on the 4 edges. I'll probably have to cut a square piece of it including a piece of a previous terrible job that I paid for, then weld a patch to replace ...
IanC's user avatar
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1 vote
1 answer
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What does it mean if the weld metal surface has a striped pattern?

I am not sure what is the best way to describe it, so here is a picture: For comparison, the metal on the other side is smoother:
hb20007's user avatar
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2 votes
2 answers
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Car bodywork welding: Is that enough penetration for a panel repair?

I'm practicing welding with the purpose of doing some bodywork on my own car soon, and lately I've been working with flux cored MIG (gasless MIG). I've some scrap 1.25mm (18 gauge) steel sheet, which ...
IanC's user avatar
  • 386
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2 answers
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Which is better for bodywork repairs: Gasless MIG welder or Stick Welder?

I was planning on investing in a small welding machine. On the future, I intend to use it for car bodywork repairs, but for now I'll probably be practicing making small tools. For a number of reasons ...
IanC's user avatar
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0 answers
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Mazda 6 TS 2006 petrol rev problem

First ever post on here and I’m not very car savvy at all so please forgive the lack of proper terminology, a bit of background first; I bought this car in October of last year and it was going okay I ...
Ollie Mcgowan's user avatar
5 votes
1 answer
3k views

Electric welding on modern car, what to disconnect?

Presently I have a BMW E60 530d which failed it's annual inspection due to corrosion around the rear jacking point (which is near the rear subframe mounting point). Typically ahead of welding (MIG or ...
Steve Matthews's user avatar
3 votes
2 answers
3k views

Removing a welded nut

There's a nut welded on my countershaft and I don't like that. How do I remove it while minimizing the chance of damage to the countershaft's threads, as damage would necessitate: a. welding a nut ...
andrey's user avatar
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3 votes
3 answers
8k views

Can Exhaust leaks be repaired by welding?

I have some small leaks(few mm) in my manifold and down pipe. As mine is a rare US manufactured car(civic vti 99) and I'm in uk, mechanic said it will be quite difficult to find the part. I aksed ...
James Wilson's user avatar
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0 votes
1 answer
239 views

Welding on the battery tray

I need some help with welding the grub screws on my car. I want to welding the grub screws on the battery tray to hold the battery to stop the battery tray to being move about on the road surface. ...
Robert Jones's user avatar
3 votes
2 answers
10k views

Welded nut broken inside subframe

So I was replacing my rear upper control arm (passenger side) for my 1995 Acura legend today, and I was trying to take out the bolts that go into the subframe. One of them was hard to turn, so I got a ...
sjfklsdafjks's user avatar
2 votes
2 answers
1k views

Why don't all welders use auto-darkening hoods? [closed]

I'm seeing auto-darkening welding helmets selling for barely more than the price of a conventional mask. But I also rarely see professional welders using auto-darkening hoods. Is there a reason for ...
feetwet's user avatar
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1 vote
0 answers
151 views

Exhaust system pipe welding

Hi everyone I have an exhaust for a motorcycle which I have to modify. The trouble is pipe which connects to the end can is of a different diameter to the bit it's supposed to connect to on the ...
MathNYYB's user avatar
  • 115
2 votes
1 answer
390 views

Jetta (Mk4) Body Repair

On a 2002 Jetta TDI, there is dirt collected at the bottom of the fender near the door hinge area. After removing the rotting fender, I find that there is some rust penetrating the structure below it....
mongo's user avatar
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4 votes
2 answers
27k views

Welding on car - damage to ECU, battery, alternator?

I had to weld nuts to the outside of rounded-out allen type bolts when removing 15-year-old rear brake calipers and carriers this weekend. As I was laying under the car welding (probably running ...
Tedwin's user avatar
  • 413
6 votes
2 answers
4k views

JB Welding a Stripped Oil Pan

I have a Honda Civic with a stripped aluminum oil pan. Right now the bolt is holding in place alright with a very slow drip, but with the next oil change I will need to make a repair. I would like to ...
FreakyDan's user avatar
  • 347
6 votes
2 answers
636 views

Welding sheetmetal

I'm looking at purchasing a 78 Chevrolet truck which has some modest rust which would most likely need to be taken care of via replacement sheetmetal and welding. I'm a decent welder (a little better ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes
5 answers
15k views

How to fix broken exhaust pipe?

I was driving down the highway and I heard a bang, a beep, and then constant scraping. I pulled to the side of a road under a bridge and looked under my car, to see this: From what I can understand, ...
Forest Kunecke's user avatar
6 votes
2 answers
777 views

Holes in exhaust manifold

On a diesel tractor, the exhaust manifold has developed two holes, possibly from thin castings, and possibly from rust. The manifold is cast iron, and I would like to patch it. A local farmer tried ...
mongo's user avatar
  • 2,115
8 votes
1 answer
339 views

Damaged tailgate strut attachment point in WRX

I have a 2003 Subaru WRX (in the USA) and the left tailgate strut attachment point is badly damaged. I have asked a few body shops and quotes are typically in the $500+ range to repair the damage by ...
copper.hat's user avatar
6 votes
2 answers
6k views

Integrity of plastic welding for car rear bumper

I have a 2010 Toyota Camry and I was involved in a minor bumper crash last week where the one of the tab that holds the bumper to the car broke off. I went to two body shops and body shop A told me ...
Chairman Meow's user avatar
8 votes
1 answer
2k views

What kind of amperage and sticks needed to weld a nut to a stripped cap/bolt?

I was trying to get a cam gear cap/bolt thing off a 2000 Volvo S80 2.9l and stripped the torx pattern out of a bolt. I'd guess it's around 1-1/2" in diameter, and this is what it looks like: I have ...
user43704's user avatar
  • 317
7 votes
2 answers
3k views

Is there a way to section a frame without fish plating?

When building a frame is there a way to join the sections together without having to fish plate?
Hᴇʀʙɪᴇ's user avatar
10 votes
4 answers
3k views

Does Tig welding a frame add more strength where fish plating isn't required?

Usually when someone builds a custom frame they are typically Mig welded and fish plated but if a frame is Tig welded does that generate better penetration when welding pieces together so you don't ...
Hᴇʀʙɪᴇ's user avatar
12 votes
1 answer
11k views

What is fish plating a frame?

When building a frame I've heard people refer to adding a fish plate. What does fish plating a frame do and what exactly is it?
Hᴇʀʙɪᴇ's user avatar
7 votes
1 answer
5k views

How to shorten a driveshaft?

How can I shorten a driveshaft? Are there any warnings before proceeding? What tools are required, and optimal? Is there a "required" way to measure correctly? How can I keep the metal square? Is ...
Jonathan Musso's user avatar