What is the recommended width of the bead for a good weld?
This helps to minimize distortion by limiting the volume of weld metal and reducing the heat input. The maximum bead width should be limited to 3/8 in. (10 mm). As a minimum, one complete circumferential bead should be completed before stopping or interrupting the welding sequence.
What four factors must an arc welder control in order to produce an acceptable bead?
The movement or weaving of the welding electrode can control the following characteristics of the weld bead: penetration, buildup, width, porosity, undercut, overlap, and slag inclusions.
What increases the bead width?
A positive electrode polarity, a large electrode diameter, a small electrode extension and a high welding voltage encourages a large bead width in most cases. For a particular electrode diameter and extension, it is found that the bead width initially increases as the current and the welding speed increase.
Is a normal distance of approximately equal to the diameter of the electrode?
ARC LENGTH – Distance between the electrode and the base metal. In SMAW, this distance should be approximately equal to the electrode diameter. 5.
How is the electrode size identified?
The electrodes are also specified based on the ratio of the diameter of the coated portion of the electrode to core wire diameter. If the ratio is less than 1.2 then electrodes are thin coated. … If the ratio exceeds 1.5 then electrodes are heavy-coated or thick coated.
How wide should a stringer bead be?
Stringer bead: A weld bead formed without appreciable weaving. … For example, one could define a stringer bead as a weld bead not wider than 3/8 inches, and one could limit weave width for weave beads to weld beads not wider than 3/4 inches.
What controls the size of the arc?
Amperage controls the size of the arc. Amperage is associated with the welding arc’s heat. Wattage, or Watts (W), is a measurement of the amount of electrical energy or power in the arc. Watts are calculated by multiplying voltage (V) times amperes (A), Figure 3-3.
What causes wide bead in welding?
Wire feed speed/amperage too high – Setting the wire feed speed or amperage too high (depending on what type of machine you’re using) can cause poor arc starts and lead to an excessively wide weld bead, burn-through and distortion.
What is the maximum width of a stringer bead in inches?
For example, one could define a stringer bead as a weld bead not wider than 3/8 inches, and one could limit weave width for weave beads to weld beads not wider than 3/4 inches.
What is weld bead characteristics?
13 Weld Bead Appearance Two characteristics of the weld bead are the bead height and width, as shown in Figure 7-13. These characteristics are important to assure that the weld joint is properly filled, with a minimum of defects, particularly in multi-pass weldments.