Browse Prior Art Database

GTAW/GMAW Arc Slot Control

IP.com Disclosure Number: IPCOM000088108D
Original Publication Date: 1977-Apr-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Goodrich, RA: AUTHOR [+2]

Abstract

A helium tight weld is to be produced between upright part 6 and the horizontally abutting part 7 using gas tungsten arc welding (GTAW) or gas metal arc welding (GMAW). The welding electrode 8, having a diameter D, extends from cup 9 which also delivers an envelope of shielding gas 10 surrounding the electrode. A slotted groove 12 of generally rectangular cross section is formed in part 7 adjoining the weld line. Groove or slot 12 has a depth of approximately D/2 and a width of about 0.6D, while the electrode extends from cup 9 a distance of 2D to 4D.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

GTAW/GMAW Arc Slot Control

A helium tight weld is to be produced between upright part 6 and the horizontally abutting part 7 using gas tungsten arc welding (GTAW) or gas metal arc welding (GMAW). The welding electrode 8, having a diameter D, extends from cup 9 which also delivers an envelope of shielding gas 10 surrounding the electrode. A slotted groove 12 of generally rectangular cross section is formed in part 7 adjoining the weld line. Groove or slot 12 has a depth of approximately D/2 and a width of about 0.6D, while the electrode extends from cup 9 a distance of 2D to 4D.

To form the weld an arc 14 is struck between electrode 8 and part 7, as shown in Fig. 1. The electrode 8 is then positioned at an angle of about 15 Degrees (Fig. 2) and caused to process along the line of the weld or interface between parts 6 and 7 to form a resulting fillet 16 (Fig. 4).

The sharp edges of the rectangular slot 12 tend to inhibit wandering of arc 14 to the upright surface of part 6, thereby confining the melt to the line of the juncture between the parts 6 and 7. By so confining the arc, bridging and the resulting leakage conditions are avoided. It provides for an improved weld metal penetration and an absence of cracking, grain boundary precipitation, voids and porosity.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]