For fill passes on a 1GF using 10 mm material, what is the recommended gun angle relative to the joint?

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Multiple Choice

For fill passes on a 1GF using 10 mm material, what is the recommended gun angle relative to the joint?

The key idea is controlling how the arc and filler metal are directed into the groove so the heat and material are distributed evenly on both sides of the joint. For fill passes on a 1GF groove in a thick plate (10 mm), centering the gun angle on the bead—essentially using a half-angle formed at the center of the bead—keeps the arc and filler balanced across the joint. This produces a symmetric bead, good fusion to both walls, and a well-shaped fill without overloading one side or creating undercut at the toes. If the gun is aimed straight along the joint (zero angle) or tilted too far toward one side (1/4 or 3/4 angles), the heat and filler concentrate more on one wall, leading to an uneven bead, possible lack of fusion at the far toe, or excessive buildup on one side. Centering the angle at the bead helps manage heat input and deposition for a robust, properly contoured fill on thick material.

The key idea is controlling how the arc and filler metal are directed into the groove so the heat and material are distributed evenly on both sides of the joint. For fill passes on a 1GF groove in a thick plate (10 mm), centering the gun angle on the bead—essentially using a half-angle formed at the center of the bead—keeps the arc and filler balanced across the joint. This produces a symmetric bead, good fusion to both walls, and a well-shaped fill without overloading one side or creating undercut at the toes.

If the gun is aimed straight along the joint (zero angle) or tilted too far toward one side (1/4 or 3/4 angles), the heat and filler concentrate more on one wall, leading to an uneven bead, possible lack of fusion at the far toe, or excessive buildup on one side. Centering the angle at the bead helps manage heat input and deposition for a robust, properly contoured fill on thick material.

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