What is electrode run-out length?
Electrode run-out length is a term used in Shielded Metal Arc Welding (SMAW) or also called the Stick Welding process.
Electrode run-out length refers to the distance of weld made by a single welding electrode during the welding process. It is determined by the length of the electrode, which is typically around 350-450mm, and the welding speed.
In simple words, electrode run-out length is the length of weld deposited by each individual electrode.
What are the effects of electrode run-out length on Welding?
During welding, the electrode run-out length affects the welding in terms of weld deposition, weld penetration, mechanical properties as well as weld appearance.
In short, electrode run-out length effects in welding are:
- Weld Penetration: Electrode run-out length can affect the depth of penetration of the weld. A shorter electrode run-out length can produce a deeper weld, while a longer electrode run-out length can result in shallower penetration. The ideal electrode run-out length for a particular welding application depends on the material being welded, the thickness of the material, and other factors.
- Welding Speed: The electrode run-out length is also related to welding speed. A longer electrode run-out length can allow for higher welding speeds, but this can also lead to reduced quality if the welding process is not properly controlled. Conversely, a shorter electrode run-out length may require slower welding speeds to ensure proper weld quality.
- Weld Bead Appearance: Electrode run-out length can affect the appearance of the weld bead. A longer electrode run-out length can result in a narrower, more focused weld bead, while a shorter electrode run-out length can produce a wider, more spread-out weld bead.
- Welding mechanical properties: A smaller Electrode run-out length results in low travel speed and hence high welding heat input while a longer run-out is equal to higher travel speed and thus better mechanical properties of the weld.
Related reading: Effects of heat input in welding.
How to increase or decrease electrode run-out length?
Electrode run-out length can be increased by using a higher travel speed or using stringer weld beads.
To reduce the electrode run-out length, you can use weld weaving or low travel speed.