Double sided welding method

Patent metadata

Field	Value
Publication number	US-10213874-B2
Application number	US-201113981379-A
Country	US
Kind code	B2
Filing date	Apr 8, 2011
Priority date	Apr 8, 2011
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A double side welding method used for producing a differential gear for welding a weld part to join a ring gear fitted on a gear case from both sides. The method uses welding distortion caused by welding to improve product accuracy. The method includes welding from both sides of a weld part where a first member and a second member, which are the objects being joined, face each other. The method is performed by first welding, which is performed from one side, and second welding, which is performed from the other opposite side from that first welding. Heat quantity adjustment, that adjusts the quantity of heat input to the weld part for the second welding, is performed after the first welding, and is carried out such that an amount of welding distortion that is the objective arises.

First claim

The invention claimed is:

1. A double side welding method for joining a first member and a second member being abutted against each other and connected by a weld part, the method including the steps of:
producing a first test member and a second test member respectively identical to the first member and the second member,
performing a first welding process from one side with respect to a weld part connecting the first and second test members and performing a second welding process, after the first welding process, on another side of said weld part connecting the first and second test members,
modeling a target distortion amount for the first test member and the second test member based on a result of actual welding distortions of the first and second welding processes performed on the weld part connecting the first and second test members,
adjusting a heat input amount to be applied to the weld part connecting the first and second members to generate a welding distortion corresponding to the modeled target distortion amount,
performing the first welding process from one side with respect to the weld part connecting the first and second members,
performing the second welding process from another side with respect to the weld part connecting the first and second members after the first welding process including the heat amount used to adjust a heat input amount with respect to the weld part connecting the first and second members so that welding distortion corresponding to the target distortion amount is generated.

2. The double side welding method according to claim 1 , wherein the first member is a member provided with a circular protruding portion, the second member is an annular member in which the protruding portion is fitted, and peripheral surfaces of the first member and the second member in fitting relation are in abutting relation in a radial direction, forming the weld part.

3. The double side welding method according to claim 2 , wherein a state measurement in the heat amount adjustment is performed on a position of an end face of the second member in an axial direction before welding over entire circumference.

4. The double side welding method according to claim 1 , wherein:
a first predetermined heat amount is applied to the first welding process from one side with respect to the weld part connecting the first and second members and
a second predetermined heat amount is applied to the second welding process from another side with respect to the weld part connecting the first and second members to adjust the heat input amount to the weld part so that a cumulative welding distortion from the first welding process and the second welding process corresponding to a cumulative target distortion amount is generated.

5. The double side welding method according to claim 1 ,
wherein when the welding distortion is targeted for the second member,
in performing one or both of the first welding process and the second welding process with respect to the weld part connecting the first and second members, a heat amount adjustment includes:
measuring a displacement of the second member before welding distortion is measured;
determining the target distortion amount based on the measured displacement; and
adjusting the heat input amount to the weld part to generate the welding distortion corresponding to the determined target distortion amount.

6. The double side welding method according to claim 1 , wherein the first welding process and the second welding process are laser welding.

7. The double side welding method according to claim 1 , wherein the method uses the first member and the second member each of which has a joint shape to constitute a hollow space in a center portion of the weld part when seen in a welding direction of the first and second welding processes.

8. A double side welding method for joining a first member provided with a circular protruding portion and an annular second member fitted on the protruding portion so that peripheral surfaces of the first member and the second member are in abutting relation in a radial direction, forming the weld part, the method including the steps of:
producing a first test member and a second test member respectively identical to the first member and the second member;
calculating undulation of the second test member;
performing a first welding process from one side with respect to a weld part connecting the first and second test members and performing a second welding process, after the first welding process, on another side of said weld part connecting the first and second test members after said calculating;
determining welding displacement based on a measurement result of a state of an end face of the second test member in an axial direction by a second welding process performed after performing the first welding process on the first and second test members;
wherein undulation of the second test member is calculated after the first welding process is performed on the first test member and the second test member;
in performing the second welding process on the first and second test members, a welding start position in a circumferential direction is determined so that the welding displacement cancels out the undulation;
performing the first welding process from one side with respect to the weld part connecting the first and second members and performing the second welding process from another side with respect to the weld part connecting the first and second members,
wherein the circumferential undulation in an end face of the second member in an axial direction is created with respect to the first member by performing the first welding process and the second welding process,
wherein the welding displacement in the circumferential direction generated by deliberate welding distortion cancels out the circumferential undulation.

9. The double side welding method according to claim 8 , wherein the second welding process performed after the first welding process with respect to the weld part connecting the first and second members includes a heat amount adjustment to adjust the heat input amount with respect to the weld part so that welding distortion corresponding to a target distortion amount is generated.

10. The double side welding method according to claim 9 , wherein the heat amount adjustment includes: preparing a first test member and a second test member respectively identical to the first member and the second member; determining the target distortion amount based on a result of welding distortion due to the first welding process and the second welding process performed on the first and second test members; and adjusting the heat input amount to the weld part to generate the welding distortion corresponding to the determined distortion amount.

11. The double side welding method according to claim 8 , wherein the first welding process and the second welding process with respect to the weld part connecting the first and second members both include a heat amount adjustment to adjust the heat input amount to the weld part so that the welding distortion corresponding to the target distortion amount is generated.

12. The double side welding method according to claim 8 , wherein the first welding process and the second welding process are laser welding.

Assignees

• Uchida Keisuke
• Iwatani Shingo
• Endo Takahito
• Kuramoto Go
• Kamitake Jun
• Yamaguchi Shuhei
• Aisin Seiki
• Toyota Motor Co Ltd

Inventors

• Uchida Keisuke
• Iwatani Shingo
• Endo Takahito
• Kuramoto Go
• Kamitake Jun
• Yamaguchi Shuhei

Classifications

• F16H55/17

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title

• B23K26/0626 Primary

  Energy control of the laser beam (B23K26/0622 takes precedence) · CPC title

• B23K26/28

  of curved planar seams · CPC title

• B23K31/003

  relating to controlling of welding distortion · CPC title

• B23K26/30 Primary

  of three-dimensional [3D] seams · CPC title