A proper weld will resemble...
A proper weld will resemble a link of caulking and should be nice and smooth.
Teams should make sure their...
Teams should make sure their welding equipment has the proper amperage to do the job right.
Shane Love, shown here building...
Shane Love, shown here building a pit road gas can, says that he and other welders at Joe Gibbs Racing have benefited from classes that bring them up-to-date with the latest technology.
People should remain dry when...
People should remain dry when welding. If they sweat heavily, then the body can become conductive and allow them to get shocked.
Its not enough just...
Its not enough just to wear a helmet when welding. Instead, racers should make sure the helmet features enough shading to provide maximum eye protection.
Welding is something all race teams do on a regular basis, whether its the NASCAR Winston Cup Series or the thousands of Friday- and Saturday-night racers across the country. However, just because welding is a common practice, that doesnt mean everyone is doing it correctly.
I see a lot of people who are welding without the proper expertise of what theyre doing, says Joe Kolasa, a welding instructor with Lincoln Electric. They need to have more training because their finished product just doesnt look good. That just gives you an opportunity to have a defect in the weld.
In an effort to increase the education of welders, Lincoln Electric offers race teams a welding school where they can go to learn about new industry trends. Much like drivers themselves, some of the veteran welders can be somewhat resistant to change something theyve been doing all their lives.
Shane Love, head welder at Joe Gibbs Racing, is aware of the need to keep up with new technologies. With this in mind, he and 16 other team members attended the five-day class Lincoln offers.
The reason I did that is because we have guys who have been welding all their lives, but they learned everything they know from doing it in the garages coming up through the Friday- and Saturday-night ranks, Love says. There is a lot that goes into welding and why things need to be done in the proper ways. The class taught us about the fundamentals of metallurgy and what a weld actually does to the material thats being welded. Every single one of those guys came back from the school and told me theyd learned something, and that surprised me because there were some guys I thought didnt need to go.
Miller Welding is another key player in the stock car ranks with teams including Hendrick Motorsports, Dale Earnhardt Inc., Roush and Richard Childress Racing. According to Andy Weyenberg, motorsports marketing manager at Miller Welding, many different factors go into not only good welds, but also safe welds.
Ninety-eight percent of the welding shops out there are not using adequate welder safety from a manufacturers standpoint, Weyenberg says. When it comes to Stock Car Racing, nearly all the welding processes are the same, whether its a Late Model short track team in California or a Winston Cup team in the Carolinas.
Stock Car Racing asked the experts to provide advice on welding. They say the key to proper welding is good education, using the correct process, the proper equipment, knowing how to inspect the weld, and using the proper safety equipment.
The main thing a welder needs is an education, Love says. There are a lot of people who weld even though they dont know what a good weld is supposed to look like. They will weld something either way too cold or way too hot. My advice would be for them to do some research on all the information thats available. You can easily go to a community college and take a basic class in welding. Thats how I learned how to weld and they taught me a great deal.
Love says there are many books on the market, too, that are descriptive on what a good and bad weld is supposed to look like. If I was a non-welder, the first thing I would do is research on what a good weld is supposed to look like, Love says. Its also important to practice what youre learning for a little while and try to make the welds look like the ones in the pictures. If it doesnt look like what the pictures show as a good weld, then they need to go back and do more research.
It could be something as simple as the welding machines temperature isnt set just right. You can spend two hours and learn the difference in appearance when it comes to a good and bad weld.
As Love says, its critical to know what a good and bad weld is supposed to look like. But successful welding goes well beyond that. Its also critical to know what kind of process is needed to make a correct weld.
For assembling stock cars, there are two main types of welding doneTIG and MIGand both require different types of procedures to get the maximum strength out of a weld.
MIG stands for Metal Inert Gas, and is a faster type of welding. TIG is the abbreviation for Tungsten Inert Gas, which is a type of electric arc welding process used primarily for thin and non-ferrous metals such as aluminum, magnesium and stainless steels.
The TIG welding process is like brazing with a torch, except that the heat source is an electric arc where the amperage can be adjusted, Kolasa says.
Its almost like using the dimmer switch in the lighting of a house, because in TIG welding you want to be able to adjust the heat level through a remote control, most commonly a foot control that can be pressed down to get more heat, and letting the pedal up to get less heat. Once the molten puddle is established, filler rod is added manually with the opposite hand.
Kolasa says one of the advantages of the TIG process is the heat level can be adjusted independent of how much filler metal is added. The operator now controls the correct level of heat in order to make a good weld.
In MIG welding, a wire is continuously fed through a gun and a gas is fed simultaneously from a bottle to protect the arc, Kolasa says. When that wire comes out, you have a certain arc length you have to maintain. Actually, the wire hits the metal and shorts out, which creates heat and melts. So the wire is constantly melting across the arc, whereas in TIG welding you are melting the metal with a separate heat source and adding filler rod by hand.
Weyenberg says that due to the time it takes to weld something major like a rollcage, the majority of teams choose the MIG process.
If you were to TIG weld a chassis, its going to take two-and-a-half times the time to do it that way compared to MIG welded, says Weyenberg. If you look at a team like Hendrick Motorsports, they MIG weld their chassis together because thats a production facility and theyre kicking cars out all the time. If they need a car, they can do that in a couple of hours whereas if they TIG weld its going to take them two days to do the same job.
Once the welder has a basic education of what hes doing and has decided whether he wants to use the TIG or MIG process, the next step is figuring out if the equipment hes using is capable of doing a quality weld. One of the most common mistakes race teams make is using welding equipment that is not up to the proper amperage or doesnt allow the recommended voltage to reach the source.
Welding is so dangerous, and Saturday-night racers are the worst because of the simple fact that they dont know how its supposed to be done, Love says. Those guys just love to race, and God bless them because they love what theyre doing. Its very important to use the right equipment for the certain type of work being done. A lot of guys will use a 110-volt welding machine when they need to be using one thats 220 volts.
An array of simple items can be easily overlooked, even something as simple as the extension cords hooked up to the welding machines.
The extension cords can cause you to drop some of the power thats needed to get a good weld, Weyenberg says. A lot of the teams I see arent using the right cord so theyre not getting the correct thickness of the conductor. You need to have the proper cords because these welding machines draw a lot of power. If you dont use the proper cord, it can be like trying to jump-start your car with a lamp cord. A lot of people dont realize theyre losing a lot of their power through their extension cords.
Another important area not to be overlooked is making sure the welding machinery has enough amperage for the job thats being done.
Some teams fail to achieve proper fusion, which basically happens, for instance, when you take a little 110-volt welding machine and work on heavy things like shock mounts, Kolasa says. Some people feel they can do anything they want with one of the smaller machines that is intended for thin materials. If you were to use that machine when it comes to something like a shock mount, you might as well skip welding it and just stick some bubble gum there instead because it wont work. Its a misunderstanding of the welding process that comes from a lack of education.
After the job is completed, its important to make a visual inspection of the weld to make sure it looks secure and safe.
You want to make sure the material deposition and travel speed are matched to get adequate penetration, Weyenberg says. The toes of the weld need to be tied into the base metal so it doesnt look like a cold-welded joint. During a crash, the tubing wants to tear away at the weld. If the toes of the weld arent tied in properly, the weld will crack. Its the same thing as having a cavity in your tooth.
When youre looking at a weld bead, the bead itself is like using a caulking gun to string out a line of caulk. The toes would be the side of that caulk, not the start and not the end; its the two sides. It should be a smooth transition.
Theres a very fine line between a good weld and a bad weld. It can be as simple as how youre holding the gun when welding. Keeping your gun at the same angle in relationship to the tubes is very critical. If you stop and move your gun from a push angle to a pull angle, the weld bead changes.
Its also important to take note, however, that a visual inspection wont always catch things such as contaminant materials in the weld that can pop up from not cleaning the base material properly.
Theres a ton of different ways to bad weld, and its not always something you can catch visually, Love says. Take somebody whos MIG welding for example. They might have the machine cranked up really hot and the weld looks all nice and flat, but if you look at the edge of the weld its undercut. You can see where the material is melted down and then the weld starts. If that area was to ever get hit or bent, thats a perfect place for a crack to happen.
Since welding can be such a dangerous job, those involved in the work need to take safety precautions. This comes from what type of clothing theyre wearing all the way to the level of shade they use for eye protection.
From my standpoint as a manufacturer, if I had to recommend what people should wear while welding, theyd be in leather chaps and have leather from head to toe, Weyenberg says. The most important thing you need is a welding helmet. A lot of guys will skip that because they think they can just shield their eyes with something to block those rays, especially when theyre inside the car welding. Another problem I see is people who will go out and buy a helmet that doesnt provide the right level of eye protection. Welding without a helmet on is a big-time no-no. There is enough quality protection out there to keep welders safe.
There are even automatic shading lenses that are great because you can keep your helmet on in a down position to see where the weld is going to be started. As soon as the trigger is pulled and theres light, that shade turns darker and protects the eyes. With that, the helmet can easily be kept on at all times without running the risk of damaging their eyes.
One of the most common mistakes welders make while they work at such a rapid pace is welding while sweating.
Its very important for the person welding to remain dry, Kolasa says. If youre out there in the sun, sweating and getting wet, thats where we see people getting hurt. You can start welding on something and be perfectly dry and safe, but when you start sweating on your gloves and things like that, then the body starts to become conductive and you can get shocked.