Apparatuses and methods for welding and for improving fatigue life of a welded joint

• US 20100089888A1
• Filed: 10/10/2008
• Published: 04/15/2010
• Est. Priority Date: 10/10/2008
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Hammerton, Mark Wayne, Yelistratov, Alexei Peter, Forck, James Anthony
• Application Number:
  US12/285,659
• Publication Number:
  US 20100089888A1
• Time in Patent Office: Days
• US Class Current: 219/136
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 2103/10 Aluminium or alloys thereof
• CPC Class Codes: B23K 2103/14 Titanium or alloys thereof
• CPC Class Codes: B23K 31/12 relating to investigating the properties, e.g. the weldability, of materials
• CPC Class Codes: B23K 33/004 Filling of continuous seams
• CPC Class Codes: B23K 9/0256 for welding ribs on plates
• CPC Class Codes: B23K 9/16 making use of shielding gas selection of media B23K35/38
• CPC Class Codes: C21D 1/40 Direct resistance heating

Abstract

A method for welding an edge of a first member to a side surface of a second member is provided. The first member and the second member are joined to one another at a joint. The method includes beveling an edge of the first member. The method also includes positioning the edge of the first member proximate the side surface of the second member. The method further includes supplying welding material via a welding wire along the edge of the first member to create a joint between the first and second members. Supplying welding material includes controlling a feed rate of the welding wire, such that a weld bead formed at the joint defines a concave cross-section.

Claims

1. A method for welding an edge of a first member to a side surface of a second member, such that the first member and the second member are joined to one another at a joint, the method comprising:

beveling an edge of the first member;

positioning the edge of the first member proximate the side surface of the second member; and

supplying welding material via a welding wire along the edge of the first member to create a joint between the first member and the second member,

wherein supplying welding material comprises controlling a feed rate of the welding wire, such that a weld bead formed at the joint defines a concave cross-section.

2. The method of claim 1, further including positioning the side surface of the second member at an angle with respect to a generally horizontal plane, and positioning the edge of the first member generally orthogonal to the side surface of the second member.

3. The method of claim 2, wherein positioning the side surface of the second member includes positioning the side surface of the second member at an angle of about forty-five degrees with respect to the generally horizontal plane.

4. The method of claim 1, wherein supplying welding material includes controlling a plurality of weld variable parameters associated with a welding assembly configured to supply welding material.

5. The method of claim 4, wherein the plurality of weld variable parameters includes at least one of the feed rate of the welding wire, a coefficient, a travel speed of the welding assembly, a cross-sectional area of the joint between the first and second members, and a diameter of the welding wire.

6. The method of claim 1, wherein supplying welding material via a welding wire includes:

positioning the welding wire at an angle with respect to a generally horizontal plane; and

positioning the welding wire generally orthogonal to the generally horizontal plane.

7. The method of claim 6, wherein positioning the welding wire at an angle includes positioning the welding wire at an angle of about twenty degrees with respect to the generally horizontal plane.

8. A method for improving fatigue life of a welded joint between a first member and a second member, the method comprising:

positioning an edge of the first member proximate a side surface of the second member;

supplying welding material via a welding wire along the edge of the first member to create a joint between the first and second members; and

controlling a feed rate of the welding wire according to a formula,

V_W≦

K·

V_T·

S_weld·

(D_W)<sup>−

2</sup>,

where V_W is the feed rate of the welding wire, K is a coefficient, V_T is a travel speed of a welding assembly being configured to supply welding material, S_weld is a cross-sectional area of the joint between the first and second members, and D_W is related to a cross-sectional area of the welding wire.

9. The method of claim 8, wherein supplying welding material includes forming a weld bead at the joint between the first and second members, wherein the weld bead defines a concave cross-section.

10. The method of claim 8, wherein controlling a feed rate includes controlling the feed rate according to the formula, where K ranges from about 0.4 to about 0.6.

11. The method of claim 8, further including positioning the side surface of the second member at an angle with respect to a generally horizontal plane, and positioning the edge of the first member generally orthogonal to the side surface of the second member.

12. The method of claim 11, wherein positioning the side surface of the second member includes positioning the side surface of the second member at an angle of about forty-five degrees with respect to the generally horizontal plane.

13. The method of claim 8, wherein supplying welding material via a welding wire includes:

positioning the welding wire at an angle with respect to a generally horizontal plane; and

positioning the welding wire generally orthogonal to the generally horizontal plane.

14. The method of claim 13, wherein positioning the welding wire at an angle includes positioning the welding wire at an angle of about twenty degrees with respect to the generally horizontal plane.

15. An apparatus for welding an edge of a first member to a side surface of a second member, comprising:

a welding assembly operable to weld the edge of the first member to the side surface of the second member, the welding assembly being configured to supply a welding wire to a joint between the first and second members at a feed rate; and

a processor operably connected to the welding assembly, the processor being configured to store one or more weld variable parameters and control the welding assembly based on at least one of the one or more weld variable parameters and a formula,

V_W≦

K·

V_T·

S_weld·

(D_W)<sup>−

2</sup>,

where V_W is the feed rate of the welding wire, K is a coefficient, V_T is a travel speed of the welding assembly, S_weld is a cross-sectional area of the joint between the first and second members, and D_W is related to a cross-sectional area of the welding wire.

16. The apparatus of claim 15, wherein the processor includes a memory for storing the one or more weld variable parameters, and a controller operably coupled to the memory and the welding assembly, the controller being configured to control the welding assembly based on at least one of the one or more weld variable parameters.

17. The apparatus of claim 15, wherein the welding assembly is configured to form a weld bead at the joint, wherein the weld bead defines a concave cross-section.

18. The apparatus of claim 15, wherein K ranges from about 0.4 to about 0.6.