SMAW Fillet Welds on Mild Steel Flashcards
Perform SMAW fillet welds on mild steel
1
Q: What are stringer beads in welding?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: A stringer bead is a single pass weld with no side-to-side motion. The only movement of the electrode is in the direction of travel, creating a straight bead with minimal width variation.
2
Q: What are the three electrodes commonly used for surface welds in SMAW?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: The three electrodes commonly used are E4310 (E6010), E4914 (E7014), and E4918 (E7018).
3
Q: What is the difference between a stringer bead and a weave bead?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: A stringer bead involves straight, unidirectional welding, while a weave bead includes side-to-side movement of the electrode as it progresses forward, producing a wider bead.
4
Q: What is the recommended inclination range for flat position welding with stringer beads?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: The recommended inclination range for flat position stringer bead welding is 5° forehand to 15° backhand.
5
Q: What are the characteristics of an E4310 (E6010) electrode when used for stringer beads?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: E4310 (E6010) electrodes provide deep penetration and are used with direct current reverse polarity (DCRP). They are ideal for applications where fast-freezing weld pools are required.
6
Q: Why are E4914 (E7014) electrodes preferred for flat-position stringer beads?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: E4914 (E7014) electrodes have a rutile-based coating with added iron powder, making them ideal for high-deposition rate welding in the flat position. They produce a smooth bead with a low spatter rate.
7
Q: What advantage does an E4918 (E7018) electrode offer for surface welding?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: E4918 (E7018) is a low-hydrogen electrode that produces a smooth, low-spatter weld with excellent mechanical properties. It is especially suited for structural welding, reducing the risk of hydrogen-induced cracking.
8
Q: What is the typical arc length for stringer beads in flat position SMAW?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: The arc length for stringer beads in flat position should be approximately equal to the diameter of the electrode core wire, ensuring a stable arc and proper bead formation.
9
Q: Why is proper electrode angle critical for stringer beads in flat welding?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: The correct electrode angle ensures the molten metal flows correctly into the joint, prevents undercut, and provides a consistent weld bead profile. For butt joints, the electrode is typically held perpendicular to the workpiece.
10
Q: What safety precautions must be taken before welding stringer beads in the flat position?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: Safety precautions include wearing appropriate PPE (gloves, helmet, goggles, etc.), ensuring proper ventilation, reviewing equipment safety procedures, and maintaining a clean work area free of flammable materials.
11
Q: How does stringer padding differ from a single stringer bead?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: Stringer padding involves multiple, overlapping stringer beads laid side-by-side to uniformly build up a surface, whereas a single stringer bead is just one continuous weld pass.
12
Q: What is the effect of increasing or decreasing travel speed when creating stringer beads?
Objective 1: Weld surface welds (stringer beads) in the flat position using E4310, E4914, and E4918 electrodes
A: Increasing travel speed reduces heat input, resulting in a narrower, lower bead with less penetration. Decreasing travel speed increases heat input, resulting in a wider, higher bead with deeper penetration.
