Welding Flux-core with NO GAS | 3G Plate Test
TLDRIn this instructional video, Luke Lewis, a pipe welder from Brownsville, Texas, demonstrates how to perform a 3G position weld on a one-inch plate using E71T-11 gas-less flux core wire. He explains the importance of proper fit-up, including using a quarter-inch gap and backing strip, and the process of tacking, root pass, hot pass, and fill passes. The video highlights the benefits of using flux core wire for hobbyists and industrial applications, showcasing a clean and efficient welding technique without the need for shielding gas.
Takeaways
- 👨🔧 The video is a tutorial on welding a 1-inch plate in the 3G position using E71T-11 gas-less flux-core wire.
- 🛠 The welder, Luke Lewis, emphasizes the importance of proper fit-up, including a 1/16-inch face on the bevels and a quarter-inch gap for the backing strip.
- 🔨 The use of a backing strip is crucial to ensure full fusion between both sides of the bevel and to prevent slag inclusion or undercut.
- 🔧 Runoff tabs are used to start and end the weld, ensuring the weld fills the entire bevel and covers the top.
- 🔌 The Miller XMT 350 Field Pro is used to power the welding process, set at 22 volts and 235 wire speed for tacking.
- 🌀 The E71T-11 wire is a self-shielding, gas-less flux-core wire that simplifies the welding process by eliminating the need for external gas.
- 🔍 A CWI (Certified Welding Inspector) checks the fit-up before starting the welding process to ensure everything is set correctly.
- 💻 The settings for the root pass include starting on the runoff tab, fusing on both sides of the wall, and avoiding undercut by controlling the welding speed.
- 🛡 After the root pass, grinding is done to clean up the weld toes, which are prone to slag inclusions.
- 🔄 For the hot pass, the same settings are used, with a focus on weaving side to side, pausing on the sides, and avoiding a high-profile bead.
- 📈 The process involves stacking stringers with adjustments in voltage and wire speed for finer control and a better-looking cap on the weld.
Q & A
What is the main topic of the video?
-The main topic of the video is welding a one-inch plate in the 3G position using E71T-11 gas-less flux core without the need for shielding gas.
Who is the presenter of the video?
-The presenter of the video is Luke Lewis, a pipe welder from Brownsville, Texas.
What is the purpose of the bevels and face on the plate?
-The bevels and face on the plate are prepared to ensure proper fit-up for welding, which is crucial for achieving a quality weld.
Why is a quarter-inch gap important in this welding process?
-A quarter-inch gap is important to ensure there is enough space for the weld to penetrate and fuse properly between the two pieces of metal.
What is the purpose of the runoff tabs in the welding process?
-Runoff tabs are used to start and end the weld, ensuring that the weld fills the entire bevel and maintains a consistent quality throughout.
What type of equipment is being used for welding in the video?
-The equipment being used is a Miller XMT 350 Field Pro, which is powering an Archery suitcase.
What are the settings for the welding machine during the tacking process?
-During the tacking process, the settings are 22 volts and 235 wire speed.
What is special about the E71T-11 wire used in the video?
-The E71T-11 wire is a gas-less flux core wire, which means it does not require shielding gas, making it convenient for various welding applications.
Why is it important to start tacking from the outside edge and work inwards?
-Starting tacking from the outside edge and working inwards prevents the formation of a crater on the outside of the bevel, which can compromise the weld quality.
What is the significance of grinding the toes of the weld?
-Grinding the toes of the weld helps to clean up the weld and remove any potential slag inclusions, ensuring a smooth and clean weld surface.
How does the welding process differ when using a gas-less flux core wire compared to traditional shielded gas welding?
-The main difference is that with a gas-less flux core wire, there is no need for external shielding gas, which simplifies the welding setup and process. The welder also uses a different type of welding cup for better control and visibility.
Outlines
🔨 Welding Preparation and Setup for 3G Position
In this segment, Luke Lewis, a pipe welder from Brownsville, Texas, introduces the task of welding a one-inch plate in the 3G position using E71T-11 gas-less flux core wire. He details the preparation process, including cleaning the bevels, creating a 1/4 inch gap for the backing strip, and ensuring proper fit-up with runoff tabs for a full bevel fill during testing. The importance of starting the tack welds at the corners and working towards the center is emphasized. Luke also discusses the use of the Miller XMT 350 Field Pro welder set at 22 volts and 235 wire speed for tacking, and he highlights the benefits of the E71T-11 wire for various welding applications, including its convenience for hobbyists and industrial uses without the need for gas cylinders or regulators.
🌟 Conducting the Root Pass and Hot Pass Welding
The second paragraph describes the process of performing the root pass on the one-inch plate. Luke maintains the welder settings at 22 volts and 235 wire speed, using a consistent technique of starting at the runoff tab, fusing both sides of the bevel, and avoiding undercut by controlling the weld speed and puddle. After the root pass, a hot pass is executed with the same settings, focusing on weaving side to side, pausing on the sides, and quickly crossing the middle to prevent a high-profile bead. The importance of grinding down the weld toes to prevent slag inclusions is also mentioned, and the process concludes with a final weave before starting to stack stringers.
🛠️ Stringer Stacking and Cap Welding Techniques
In the final paragraph, Luke proceeds with stacking stringers on the prepared plate, adjusting the welder settings to 19.5 volts and 175 wire speed for smaller, more controlled movements. He emphasizes pausing longer on the beveled edge and using the runoff tab to ensure proper puddle spread. After completing the first two stringers and receiving approval from David, Luke continues to stack two more stringers, this time weaving slightly wider. He also discusses changing the welding cup for better arc control and visibility due to the self-shielding nature of the E71T-11 wire. The paragraph concludes with the application of a three-bead cap, using the same settings as before, and ensuring a proper fusion of the bevel and even cap formation. Upon completion, David is called to inspect the final weld, marking the end of the demonstration.
Mindmap
Keywords
💡Welding
💡3G Position
💡Flux-core
💡E71T-11
💡Bevel
💡Backing Strip
💡Runoff Tabs
💡Tack Weld
💡Miller XMT 350
💡Wire Speed
💡Cap Pass
Highlights
Luke Lewis, a pipe welder from Brownsville, Texas, demonstrates welding a 1-inch plate in the 3G position using E71T-11 and a gas-less flux core.
The importance of cleaning bevels and preparing the plate with a 3/32nd face for welding is emphasized.
A quarter-inch gap is set for the plate with a quarter-inch backing strip to ensure proper fusion.
Runoff tabs are crucial for the weld to fill the entire bevel during testing.
Luke explains the process of tacking the plate, starting from the outside edge to prevent cratering.
The Miller XMT 350 Field Pro is used for its versatility in welding settings.
E71T-11, a gas-less flux core, offers convenience without the need for gas cylinders or regulators.
The CWI checks the fit-up before starting the welding process to ensure quality.
Root pass welding techniques are detailed, including starting on the runoff tab and fusing both sides of the wall.
The use of a 1/8 grinding disc to clean the weld toes and prevent slag inclusions is highlighted.
Hot pass welding is performed with the same settings, focusing on avoiding undercut and high-profile beads.
The technique of weaving and pausing on the sides to build up the weld is demonstrated.
Filling the weld with stringers using adjusted settings for better control and visibility.
The change in the welding cup to improve arc control and visibility due to the absence of shielding gas.
Stringer stacking is shown with a focus on even cap formation and avoiding uneven buildup.
The final cap pass焊接技术, creating a three-bead cap to finish the weld.
A review by David to ensure the weld meets quality standards before completion.
The video concludes with a reminder to like, comment, and subscribe for more welding insights.
