Filler metal for TIG welding

Patent metadata

Field	Value
Publication number	US-11679453-B2
Application number	US-202016898937-A
Country	US
Kind code	B2
Filing date	Jun 11, 2020
Priority date	Aug 20, 2013
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

The present invention provide a filler metal for TIG welding capable of stable welding, of which heat flux feeding area is wider than conventional wire filler metal and heat input per unit length is increased. The filler metal for TIG welding which is continuously supplied on a base metal to be melted by an arc after forming the arc between the base metal and an electrode over the base metal and supplying shield gas around the arc, wherein the cross-section of the filler metal has curved shape of which surface facing the electrode is concavely curved to the electrode.

First claim

The invention claimed is:

1. A filler metal for Tungsten Inert Gas (TIG) welding,
of which a cross-section of the filler metal has a concavely curved shape,
wherein a concavely curved surface of the filler metal is determined by a curve connecting normal lines to plasma streamlines,
a shape f(r) of the plasma streamlines is defined by a following equation,

f
⁡
(
r
)

=

f
⁡
(
0
)

⁢

e

-

(

r
2

2
⁢

σ
2

)

where, r is a distance along a radius direction when an electrode is assumed to a center, f(0) is a vertical distance from the electrode to a base metal, and σ means variance, a value of the σ is selected in accordance with the distance along the radius direction,
wherein one normal line to the plasma streamlines is obtained at a cross point with the normal lines of an adjacent plasma streamlines.

2. The filler metal of claim 1 , wherein a width of the cross-section of the filler metal is in the range of 3 mm to 10 mm and a thickness of the cross-section of the filler metal is in the range of 0.3 mm to 1 mm.

3. The filler metal of claim 1 , wherein the filler metal is formed of stainless steel.

4. The filler metal of claim 1 , wherein the filler metal is formed of at least one selected from sus300 group, duplex sts2209 and super duplex.

5. A filler metal for Tungsten Inert Gas (TIG) welding that is based on an arc between a base metal and an electrode,
wherein a cross-section of the filler metal is in a shape of a plane board represented by width and thickness, the thickness of the central plane board is thicker than that of the other plane board,
wherein the thickness of the central plane board is in the range of 1.1 to 2 times of the thickness of the other plane board.

6. A method for defining a cross-sectional shape of a filler metal for Tungsten Inert Gas (TIG) welding having a concavely curved shape,
Determining a concavely curved surface of the filler metal by connecting curve normal lines to plasma streamlines,
wherein a shape f(r) of the plasma streamlines is defined by a following equation,

f
⁡
(
r
)

=

f
⁡
(
0
)

⁢

e

-

(

r
2

2
⁢

σ
2

)

where, r is a distance along a radius direction when an electrode is assumed to a center, f(0) is a vertical distance from the electrode to a base metal, and σ means variance, a value of the σ is selected in accordance with the distance along the radius direction,
wherein one normal line to the plasma streamlines is obtained at a cross point with the normal lines of an adjacent plasma streamlines.

Assignees

• Nat Univ Pukyong Ind Univ Coop Found
• Pukyong National Industry Univ Cooperation Foundation

Inventors

• Cho Sang-Myung
• Oh Dong-Soo
• Ham Hyo-Sik
• Ha Hyeon-Joo
• Shin Hee-Seop
• Jun Jae-Ho
• Byun Jae-Gyu
• Park Jung-Hyun
• Kwon Hyuk-Yong

Classifications

• B23K35/0277 Primary

  of non-circular cross-section · CPC title

• B23K9/167 Primary

  and of a non-consumable electrode · CPC title

• B23K35/02

  characterised by mechanical features, e.g. shape · CPC title