How to TIG Weld an Aluminum Lap Joint
TIG welding is one of the most used welding processes, and it is important to know that it takes time to master the TIG welding process, especially the aluminum lap joints. You need to know the best way to weld a joint that is strong, durable, and resistant to rust.
This article will give you some useful information about TIG welding, including tips for welding an aluminum lap joint, how to weld a thin aluminum strip, and a few useful TIG welding supplies that are perfect for aluminum TIG welding.
If you want to learn more about TIG welding, read on below:
Process of TIG Weld an Aluminum Lap Joint
When making a weld on an aluminum lap joint, you should always start with good preparations because poor preparation may result in a weld that cannot be repaired or, worse, may not even be repairable. You will find a few methods of joining aluminum, which may require different steps and materials.
To understand how to tig weld aluminum, you need to know what you are welding and see where on the lap joint to make the weld. You will also need to decide if you are using gas tungsten arc welding (GTAW) or plasma arc welding (PAW).
GTAW and PAW work with different heat sources, arc currents, and arc voltages. I prefer the PAW because it has a higher arc current that gives you more heat and a cleaner weld. In addition, I also like PAW because it is safer to use as there is less carbon in the weld which means less risk of arc splatter. I do most of my welding at around 60-80% power and an angle of 45 degrees.
You should also know how to prepare the aluminum before you make a weld because this will make it easier for you. Before you start the process of making a weld, you must clean the surface of the joint with water. It is advisable to make sure that you clean any oils off the aluminum and dry the joint.
Also, you should sand the joint with 180 grit paper and then lightly oil the joint before you make the weld. This will keep your joint protected and clean during the welding process.
Difficulties with Welding Aluminum
Aluminum is one of the hardest metals to weld, and the welder faces three types of challenges.
1. Aluminium is soft and easily damaged during machining and fabrication, making it difficult to machine into the desired shape.
2. It’s difficult to heat due to its low thermal conductivity.
3. There’s a risk of cracking due to stress when working with the material.
These three factors often combine to make welding aluminum difficult, but as a general rule, you can expect to spend longer than you would with other metals when welding.
PRO Tips of TIG Welding Aluminum Lap Joints
I had no idea that aluminum welding was so different from steel welding. I bought a couple of tools and a few items online for this guide, and I hope you enjoy it!
This is a step-by-step guide to tig welding aluminum lap joints.
TIG welding uses a gas shield to keep your workpiece protected. You must understand the gas shield to get the right setup for your tig welder. Gas shields are made of either argon, depending on the job.
You need to research the type of gas shield you will be using. I chose an argon shield for this project because it is the easiest to learn and use.
A torch is used to heat the tip of the metal. You must ensure the tip is heated to at least 1300 degrees Fahrenheit. You will be doing a lot of cutting and welding and want it to start out hot and finish hot.
You will also need a flux core rod to start the welding process. You should purchase this material from a welding supply store and have them show you how to use it. I recommend you not use the one that came with the purchased equipment.
When the lap joint is heated up to 1300 degrees and you are ready to weld, you turn on the machine and start welding. Once the first joint is complete, you will move on to the next.
TIG welding aluminum lap joints take some practice and skill, but it is not a hard thing to do. This is a really useful technique to know, and I am sure you will find a use for it in your garage or shop in the future.
Safety Precautions When TIG Welding Aluminum Lap Joints
When welding aluminum lap joints, it is important to take safety precautions. Many common mistakes that can lead to injuries are trying to weld aluminum without proper protective gear, welding with sparks, and using improper heat waves.
Issues with Aluminum
When welding aluminum lap joints, it is important to be aware of potential issues. Here are a few examples:
1. Aluminium may not heat up even when welded together. This can lead to a decrease in quality control and accuracy when welding aluminum lap joints.
2. Aluminum may become hot enough to cause skin Fires. If this occurs, the aluminum overhang should trim off carefully to prevent any dangerous molten aluminum from coming into contact with bystanders or other machinery.
3. Another issue with aluminum lap joints is that they can become brittle if not used cautiously.
4. While the welds should be strong, it’s important to use correct heat treatment techniques when welding these materials.
Aluminum and Heat
When welding aluminum lap joints, it is important to use proper heat treatment to prevent the welds from darkening and deforming. With proper heat treatment, these welds will be strong and durable.
A properly welded aluminum lap joint will resist tears and last many years. The use of a TIG weld allows for an even weld quality and results in shorter weld times.
Summary
In conclusion, you can either have your lap joint joinery built with welds or rivets, but don’t go cheap on a metal lap joint. Your lap joint should be properly constructed with all the proper hardware included for optimal strength and functionality. You’ll probably want to have your lap joints reinforced for future use, but for now, you’re ready to test your handiwork.
