阅读说明：本技术 一种防止氧化新型螺母焊方法 (Novel nut welding method capable of preventing oxidation ) 是由 邢晓芳 韩佩 周勇 路浩 于 2019-10-15 设计创作，主要内容包括：一种防止氧化新型螺母焊方法,1)将特制的带有许多喷气孔的氩气喷气管安装在上电极外围,所述的氩气喷气管绕着上电极一圈的位置均设有喷气孔,喷气孔有一定的方向性(与水平线夹角为45°)；将特制的带有氩气喷气孔(喷气孔垂直于水平线)的定位栓和下电极安装好；2)开始螺母凸焊,当上电极将螺母与板材压紧时,喷气管打开,进行气体防护；3)焊接完成后,上电极开始上移,喷气管关闭。本发明可以大幅减少凸焊螺母顶端及凸点氧化情况的发生,降低螺纹变形的概率,减少因凸点氧化而虚焊的情况,实现高效率螺母凸焊。大幅度减小了螺纹变形及虚焊的概率,减少了因螺纹变形而导致工件报废的情况,省去了因虚焊而人工补焊的工序,降低成本,提高焊接效率,大幅提高了企业经济效益。(A novel nut welding method for preventing oxidation, 1) install the purpose-made argon gas ejector pipe with many gas orifices on the periphery of upper electrode, the said argon gas ejector pipe has gas orifices all around the position of one turn of upper electrode, the gas orifice has certain directionality (45 degrees of included angle with horizontal line); a specially-made positioning bolt with an argon gas jet hole (the jet hole is vertical to the horizontal line) and a lower electrode are installed; 2) starting projection welding of the nut, and opening the gas ejector pipe to perform gas protection when the upper electrode presses the nut and the plate tightly; 3) and after the welding is finished, the upper electrode starts to move upwards, and the gas injection pipe is closed. The invention can greatly reduce the oxidation of the top end of the projection welding nut and the salient points, reduce the probability of thread deformation, reduce the false welding caused by the oxidation of the salient points and realize high-efficiency projection welding of the nut. The probability of thread deformation and false welding is greatly reduced, the condition that workpieces are scrapped due to thread deformation is reduced, the manual repair welding process due to false welding is omitted, the cost is reduced, the welding efficiency is improved, and the economic benefit of enterprises is greatly improved.)

1. A novel nut welding method capable of preventing oxidation is characterized by comprising the following steps:

1) a specially-made argon gas jet pipe with a plurality of jet holes is arranged at the periphery of the upper electrode, the positions of the argon gas jet pipe surrounding the upper electrode for one circle are all provided with the jet holes, and the jet holes have certain directionality (the included angle between the jet holes and the horizontal line is 45 degrees); a specially-made positioning bolt with an argon gas jet hole (the jet hole is vertical to the horizontal line) and a lower electrode are installed;

2) starting projection welding of the nut, and opening the gas ejector pipe to perform gas protection when the upper electrode presses the nut and the plate tightly;

3) and after the welding is finished, the upper electrode starts to move upwards, and the gas injection pipe is closed.

Technical Field

The invention belongs to the technical field of welding processes, and particularly relates to a novel nut welding method capable of preventing oxidation.

Background

The projection welding of the nut is a key technology in the white automobile body manufacturing process, the nut can be accurately positioned by adopting the projection welding process, the welding quality is improved, the harm of harmful gas to human bodies can be reduced compared with the carbon dioxide gas shielded welding, and the projection welding of the nut is widely applied in the automobile industry. However, due to the oxidation problem in the welding process, the problems of thread deformation, insufficient welding and the like are easy to occur, so that the workpiece is scrapped or secondary manual repair welding is performed, and the subsequent assembly is difficult, so that the oxidation in the welding process is effectively prevented, which is particularly important.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a novel nut welding method capable of preventing oxidation, which is suitable for welding a projection welding nut and a steel plate, greatly reduces the probability of thread deformation and insufficient welding, reduces the condition of workpiece scrapping caused by thread deformation, omits the procedure of manual repair welding caused by insufficient welding, reduces the cost, improves the welding efficiency and greatly improves the economic benefit of enterprises.

In order to achieve the purpose, the invention adopts the technical scheme that:

a novel nut welding method capable of preventing oxidation comprises the following steps:

1) a specially-made argon gas jet pipe with a plurality of jet holes is arranged at the periphery of the upper electrode, the positions of the argon gas jet pipe surrounding the upper electrode for one circle are all provided with the jet holes, and the jet holes have certain directionality (the included angle between the jet holes and the horizontal line is 45 degrees); a specially-made positioning bolt with an argon gas jet hole (the jet hole is vertical to the horizontal line) and a lower electrode are installed;

2) starting projection welding of the nut, and opening the gas ejector pipe to perform gas protection when the upper electrode presses the nut and the plate tightly;

3) and after the welding is finished, the upper electrode starts to move upwards, and the gas injection pipe is closed.

The invention has the beneficial effects that:

1) the method can greatly reduce the oxidation of the top end and the interior of the projection welding nut, further reduce the probability of thread deformation, reduce the condition of workpiece scrapping caused by thread deformation, reduce the cost and improve the economic benefit of enterprises.

2) The method can greatly reduce the occurrence of the oxidation of the salient points of the projection welding nut, reduce the false welding caused by the oxidation of the salient points, reduce the manual repair welding procedure caused by the false welding and realize the high-efficiency projection welding of the nut.

3) As shown in figure 1, the gas ejector pipe is provided with gas ejecting holes all around the upper electrode in a circle, the gas ejecting holes have certain directionality (45 degrees included angle with the horizontal line), argon can be accurately ejected around the nut to be welded, the lower electrode and the positioning bolt are also provided with the gas ejecting holes, the argon can be accurately ejected inside the nut, and the nut and the salient points are protected from being oxidized.

Drawings

FIG. 1 is a schematic view of a welding apparatus according to the method of the present invention.

Fig. 2 is a view of a weld nut without the method of the present invention, and it can be observed that the nut tip and the bumps are oxidized more severely.

Fig. 3 is a diagram of a weld nut using the method of the present invention, and a significant reduction in nut tip and bump oxidation is observed.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

A novel nut welding method capable of preventing oxidation comprises the following steps:

1) a specially-made argon gas jet pipe with a plurality of jet holes is arranged at the periphery of the upper electrode, the positions of the argon gas jet pipe surrounding the upper electrode for one circle are all provided with the jet holes, and the jet holes have certain directionality (the included angle between the jet holes and the horizontal line is 45 degrees); a specially-made positioning bolt with an argon gas jet hole (the jet hole is vertical to the horizontal line) and a lower electrode are installed;

2) starting projection welding of the nut, and opening the gas ejector pipe to perform gas protection when the upper electrode presses the nut and the plate tightly;

3) and after the welding is finished, the upper electrode starts to move upwards, and the gas injection pipe is closed.

The occurrence of the oxidation condition at the top end and the inside of the projection welding nut can be greatly reduced, the probability of thread deformation is further reduced, the condition that workpieces are scrapped due to thread deformation is reduced, the cost is reduced, and the economic benefit of an enterprise is improved.

The method can greatly reduce the occurrence of the oxidation condition of the convex points of the projection welding nut, reduce the condition of insufficient soldering caused by the oxidation of the convex points, reduce the manual repair welding procedure caused by the insufficient soldering and realize the high-efficiency projection welding of the nut.

A specially-made argon gas jet pipe with a plurality of jet holes is arranged on the upper electrode, as shown in figure 1, the jet holes are arranged on the jet pipe around the upper electrode in a circle, and the jet holes have certain directionality (45 degrees from the horizontal line), so that the argon gas can be accurately jetted around the nut to be welded to protect the nut from being oxidized; the special positioning bolt with the argon gas fumarole and the lower electrode are installed, and the fumarole can effectively prevent the inside and the top end of the nut from being oxidized. And then, starting projection welding of the nut, and opening the gas ejector pipe to perform gas protection when the upper electrode presses the nut and the plate. And after the welding is finished, the upper electrode starts to move upwards, and the gas injection pipe is closed.

Fig. 2 is a view of a weld nut without the method of the present invention showing severe oxidation of the nut tips and the bumps, and after welding according to the above embodiment, as shown in fig. 3, a view of a weld nut with the method of the present invention showing significantly reduced oxidation of the nut tips and the bumps is shown. The probability of thread deformation and false welding is greatly reduced, the condition that workpieces are scrapped due to thread deformation is reduced, the manual repair welding process due to false welding is omitted, the cost is reduced, the welding efficiency is improved, and the economic benefit of enterprises is greatly improved.