Welding Flux-core with NO GAS | 3G Plate Test

WeldTube
20 Dec 202111:16

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

00:00

🔨 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.

05:00

🌟 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.

10:07

🛠️ 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

Welding is a fabrication process that joins materials, usually metals, by causing coalescence through the use of heat and pressure. In the context of the video, welding is the primary activity, where the host demonstrates the process of joining a one-inch plate in the 3G position without the use of shielding gas, which is a common practice in various industries.

💡3G Position

The 3G position refers to a specific orientation of the welding joint where the plate is in a vertical position and the weld is made from the top of the joint. It is one of the more challenging positions for welders due to gravity's effect on the weld pool. In the script, the host is welding a plate in this position, which is a common test for welder qualifications.

💡Flux-core

Flux-core welding is a type of arc welding that uses a tubular wire filled with flux to create the welding arc and protect the weld pool. The script mentions using a 'gas-less flux core' which eliminates the need for an external shielding gas, making the process more portable and convenient for various applications.

💡E71T-11

E71T-11 is a specific type of flux-core welding wire that is self-shielding, meaning it does not require an external gas for protection. It is used for welding on a variety of metals and is highlighted in the video as the wire of choice for the demonstration, emphasizing its utility in situations where gas shielding is not available or practical.

💡Bevel

A bevel is a type of joint preparation where the edges of the materials to be joined are cut at an angle to allow better penetration of the weld. In the script, the host mentions cleaning up the bevels and ensuring a proper fit-up for the welding process, which is crucial for achieving a strong and quality weld.

💡Backing Strip

A backing strip is a piece of metal placed behind the joint to provide support and prevent the weld from collapsing. The script describes using a quarter-inch backing strip to ensure a proper gap for the weld, which is important for the weld's structural integrity and quality.

💡Runoff Tabs

Runoff tabs are small extensions of the base metal at the start and end of a weld joint that allow the welder to start and finish the weld cleanly. They are important for the script's context as they ensure the weld fills the entire bevel and provides a good starting and stopping point for the welding process.

💡Tack Weld

A tack weld is a temporary weld used to hold parts of a weldment in position before the final welds are made. In the video script, the host describes tacking the corners of the plate and then tacking in the center, which is a standard procedure to ensure the correct alignment and fit-up of the joint before the actual welding begins.

💡Miller XMT 350

The Miller XMT 350 is a welding machine mentioned in the script, which is used to power the welding process. It is a field-pro model, indicating it is designed for use in various environments and conditions, showcasing the versatility and reliability of the equipment used in the welding demonstration.

💡Wire Speed

Wire speed in welding refers to the rate at which the welding wire is fed into the weld. The script specifies the wire speed setting of 235, which is an important parameter to control the deposition rate of the weld metal and ensure a consistent and quality weld.

💡Cap Pass

A cap pass is the final pass made on a weld to provide a smooth, finished surface. In the script, the host describes the process of applying a three-bead cap to the weld, which is crucial for both the aesthetics and the quality of the final weld joint.

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.