Tubular joints are common in different welding industries especially in construction of automotive, cars, vehicles and other pressure vessels, heat exchangers, boilers and nuclear plants etc. These joints are welded in three angles including thirty 30, forty five 45 and ninety 90 degree angles. So there are proper techniques and procedures to qualify these welds and only the authorized welder is allowed to made them.
Problems in such kinds of welds
- Don't make cold welds.
- Lack of Penetration.
- Lack of Fusion.
- Unweld Sections.
- Improper Joint Preparation.
Welding Equipment
- MIG Welder
- Gas Shielding (75% Argon and 25% Carbon dioxide)
Technique for 90 degree angle Tubular joint
1. First cut the pieces in order to ensure good fit-up and joint. It is really important to produce quality and strong welds.
2. Then make the tacks to support the assembly. Try to make tacks at corners.
3. Use Pull Technique to deposit the weld. This will lead to more penetration and fusion due to more heat supplied to the filler wire.
Technique for 30 degree angle Tubular Joint
1. Cut the pieces to ensure good fit-up and joint.
2. Prepare the assembly by tacking.
3. Start the weld from the deepest part of the joint using the 'Push technique'. Ensure your gun able to access the deep section.
Technique for 45 degree angle Tubular Joint
Here the part is pretty much deeper as compare to the 30 degree angle joint. You have to increase wire stick out in the gun so that it may able to get to the deepest section.
Increase the heat settings in order to get sound penetration and fusion results. Start from the deeper section and finish the weld at the bottom.
