阅读说明：本技术 一种中厚度钢板拼板埋弧焊缝的自动等离子气刨清根工艺 (Automatic plasma air gouging back gouging process for submerged-arc welding seams of medium-thickness steel plate splicing plates ) 是由 张继军 雷炳育 邵丹丹 陈立群 谭国平 曾繁强 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种中厚度钢板拼板埋弧焊缝的自动等离子气刨清根工艺,第一步,对拼板构件进行翻身,使坡口背面朝上放置；第二步,选择等离子气刨设备；第三步,选择压缩空气作为等离子气体；第四步,选择配套的轨道型行走小车；第五步,沿着平行于未焊透缺陷的方向铺设行走小车路轨,将气刨枪安装在小车夹持装置后,调节气刨枪的角度和位置；第六步,预测未焊透缺陷深度,根据未焊透缺陷处的深度匹配气刨电流、气刨速度进行气刨清根工序；第六步：采用小锤和钢丝刷清理气刨坡口的金属残渣。本发明能够实现厚度25mm及以下钢板拼板埋弧焊缝的自动等离子气刨清根,有效降低气刨噪音、烟尘污染,降低劳动强度,提高气刨过程稳定性。(The invention discloses an automatic plasma air gouging back chipping process for submerged-arc welding seams of jointed boards of medium-thickness steel plates, which comprises the following steps of firstly, turning over a jointed board member to enable the back of a groove to be placed upwards; secondly, selecting plasma air gouging equipment; thirdly, selecting compressed air as plasma gas; fourthly, selecting a matched rail type walking trolley; fifthly, paving a travelling trolley rail along a direction parallel to the direction of the incomplete penetration defect, installing the air gouging gun on a trolley clamping device, and adjusting the angle and the position of the air gouging gun; sixthly, predicting the depth of the incomplete penetration defect, and carrying out a gouging process according to the depth matching gouging current and gouging speed of the incomplete penetration defect; and a sixth step: and cleaning metal residues of the gouging groove by adopting a small hammer and a steel wire brush. The automatic plasma gouging machine can realize the gouging of the submerged-arc welding seams of the jointed steel plates with the thickness of 25mm or below, effectively reduce the gouging noise and smoke pollution, reduce the labor intensity and improve the stability of the gouging process.)

1. An automatic plasma air gouging back gouging process for submerged arc welding seams of medium-thickness steel plate splicing plates is characterized by comprising the following steps:

firstly, turning over a splicing plate member to enable the back of a groove to be placed upwards;

secondly, selecting plasma air gouging equipment;

thirdly, selecting compressed air as plasma gas, wherein the pressure of the compressed air is 0.40-0.45 MPa;

fourthly, selecting a matched rail type walking trolley, wherein the walking speed of the trolley can be adjusted at will, the maximum walking speed of the trolley is more than or equal to 90cm/min, the angle adjusting range of the trolley clamping device can rotate +/-90 degrees around the Y axis, and meanwhile, the trolley clamping device can perform transverse movement adjustment and longitudinal movement adjustment;

fifthly, paving a travelling trolley rail along a direction parallel to the direction of the incomplete penetration defect, installing the air gouging gun on a trolley clamping device, and adjusting the angle and the position of the air gouging gun;

sixthly, predicting the depth of the incomplete penetration defect, and carrying out a gouging process according to the depth matching gouging current and gouging speed of the incomplete penetration defect; monitoring the position of the plasma arc to avoid deviating from the position of the incomplete penetration defect;

the seventh step: and cleaning metal residues of the gouging groove by adopting a small hammer and a steel wire brush.

2. The gouging process of claim 1, wherein the gouging process is for submerged arc welding of steel plate panels having a thickness of 25mm or less.

3. The gouging process according to claim 1 or 2, wherein the groove of the weld is a Y-groove or an I-groove.

4. The gouging process according to claim 1, wherein in the second step, the rated output current of the plasma power supply is not less than 120A, the rated output duty ratio is 100%, and the aperture diameter of the nozzle of the gouging gun is phi 2.5 mm.

5. The gouging process according to claim 1, wherein in the fourth step, the gouging gun is tilted backward with respect to the direction of travel and forms an angle of 30-35 ° with the direction of travel; the position of the air gouging gun is the position of the air gouging gun centering incomplete penetration defect, and the distance between the nozzle of the air gouging gun and the surface of the jointed plate workpiece is 1-3 mm.

6. The gouging process according to claim 1, wherein in the sixth step, the gouging current is 90-120A and the gouging speed is 35-55 cm/min.

Technical Field

The invention relates to the technical field of back air gouging back of plate alignment submerged-arc welding seams (Y-shaped grooves and I-shaped grooves) of steel plates with the thickness of 25mm and below in ship building projects.

Background

In the small erection stage of ship construction, the welding of related medium and small jointed boards such as bottom boards, decks, flat outer plates, wall plates and the like is generally carried out by adopting single-wire and double-wire submerged arc welding to carry out double-side welding. In order to avoid the problems of molten pool collapse, burnthrough and the like in the front welding process, the bevel is usually large in truncated edge size or is not provided with the bevel, and the incomplete penetration defect is left on the back of the bevel after the front welding is finished. Before welding the back weld, back gouging is carried out on the back of the groove, and the back weld is welded after incomplete penetration defects are removed.

The traditional back chipping process adopts a carbon arc air gouging mode, melts metal by using electric arc generated between a carbon rod and a steel plate, and blows off the molten metal by using compressed air to realize the cleaning or processing process of the metal. However, in the carbon arc gouging process, the noise generated by the electric arc is large, a large amount of smoke is generated in the carbon rod consumption process, and even carbon elements enter the gouging surface of the gouging to form a carburized layer, so that the mechanical property, the welding property and the like of the steel plate are influenced. Moreover, most carbon arc gouging equipment is manually operated, and is difficult to carry out automated transformation, and gouging process intensity of labour is big, and process stability is also relatively poor, and the gouging bevel is comparatively crude usually. After the carbon arc gouging is finished, the gouging groove needs to be polished, a carburized layer of the gouging groove is removed, a bevel face is trimmed at the same time, and the labor workload is further increased.

Disclosure of Invention

In view of the above, the invention provides an automatic plasma air gouging process for submerged-arc welded seams of medium-thickness steel plates, which adopts a traveling trolley to cooperate with the plasma air gouging process to carry out the back gouging treatment, realizes the automatic plasma air gouging operation on the back surfaces of the submerged-arc welded seams of the medium-thickness steel plates, and solves the problems of serious air gouging noise and smoke pollution of the welded seams of the plates, high labor intensity of the air gouging, rough air gouging grooves and the like.

In order to solve the technical problems, the invention adopts the following technical scheme:

an automatic plasma air gouging back gouging process for submerged arc welding seams of medium-thickness steel plate splicing plates comprises the following steps:

firstly, turning over a splicing plate member to enable the back of a groove to be placed upwards;

secondly, selecting plasma gouging equipment, wherein the rated output current of a plasma power supply is more than or equal to 120A, the rated output temporary load rate is 100%, and the aperture phi of a nozzle of a gouging gun is 2.5 mm;

thirdly, selecting compressed air as plasma gas, wherein the pressure of the compressed air is 0.40-0.45 MPa;

fourthly, selecting a matched rail type walking trolley, wherein the walking speed of the trolley can be adjusted at will, the maximum walking speed of the trolley is more than or equal to 90cm/min, the angle adjusting range of the trolley clamping device can rotate +/-90 degrees around the Y axis (which is perpendicular to the walking direction of the trolley and parallel to the surface of the steel plate), and meanwhile, the trolley clamping device can perform transverse movement adjustment and longitudinal movement adjustment;

fifthly, paving a travelling trolley rail along a direction parallel to the direction of the incomplete penetration defect, installing the air gouging gun on a trolley clamping device, and adjusting the angle of the air gouging gun to enable the air gouging gun to be inclined backwards relative to the advancing direction and form an included angle of 30-35 degrees with the advancing direction; adjusting the position of the air gouging gun to enable the air gouging gun to be centered on the position without the penetration defect, and enabling the distance between the nozzle of the air gouging gun and the surface of the jointed plate workpiece to be 1-3 mm;

sixthly, predicting the depth of the position of the incomplete penetration defect, and performing a gouging process according to the depth matching gouging current of 90-120A and the gouging speed of 35-55cm/min of the position of the incomplete penetration defect; and monitoring the position of the plasma arc to avoid the plasma arc deviating from the position of the incomplete penetration defect.

The seventh step: and cleaning metal residues of the gouging groove by adopting a small hammer and a steel wire brush.

Preferably, the air gouging back gouging process is performed on submerged-arc welded seams of steel plate jointed boards with the thickness of 25mm or less.

Preferably, the groove of the weld is a Y-groove or an I-groove.

Compared with the prior art, the invention has the beneficial effects that:

the automatic plasma gouging machine can realize automatic plasma gouging of submerged-arc welding seams (Y-shaped grooves and I-shaped grooves) of jointed steel plates with the thickness of 25mm or below, effectively reduce gouging noise and smoke pollution, reduce labor intensity, improve stability of a gouging process, eliminate carburization risks of the gouging grooves and reduce or avoid grinding and finishing work of the gouging grooves.

Drawings

FIG. 1 is a schematic view of the gouging position of a Y-groove jointed plate;

FIG. 2 is a schematic view of the gouging position of the I-groove jointed plate;

FIG. 3 is a first schematic view of the installation angle of the gouging gun;

fig. 4 is a schematic view of the mounting position of the gouging gun.

Detailed Description

In order to make the present invention more clear and intuitive for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

An automatic plasma air gouging back gouging process for submerged arc welding seams of medium-thickness steel plate splicing plates comprises the following steps:

firstly, turning over a splicing plate member to enable the back of a groove to be placed upwards;

secondly, selecting plasma gouging equipment, wherein the rated output current of a plasma power supply is more than or equal to 120A, the rated output temporary load rate is 100%, and the aperture phi of a nozzle of a gouging gun is 2.5mm, and the equipment is specifically selected according to actual conditions;

thirdly, selecting compressed air as plasma gas, wherein the pressure of the compressed air is 0.40-0.45 MPa;

fourthly, selecting a matched rail type walking trolley GCD400-1, wherein the walking speed of the trolley can be adjusted at will, the maximum walking speed of the trolley is more than or equal to 90cm/min, the angle adjusting range of the trolley clamping device can rotate +/-90 degrees around the Y axis (which is perpendicular to the walking direction of the trolley and parallel to the surface of the steel plate), and meanwhile, the trolley clamping device can perform transverse movement adjustment and longitudinal movement adjustment;

fifthly, paving a travelling trolley rail along a direction parallel to the direction of the incomplete penetration defect, installing the air gouging gun on a trolley clamping device, and adjusting the angle of the air gouging gun to enable the air gouging gun to be inclined backwards relative to the advancing direction and form an included angle of 30-35 degrees with the advancing direction; adjusting the position of the air gouging gun to enable the air gouging gun to be centered on the position without the penetration defect, and enabling the distance between the nozzle of the air gouging gun and the surface of the jointed plate workpiece to be 1-3 mm;

sixthly, predicting the depth of the position of the incomplete penetration defect, and performing a gouging process according to the depth matching gouging current of 90-120A and the gouging speed of 35-55cm/min of the position of the incomplete penetration defect; and monitoring the position of the plasma arc to avoid the plasma arc deviating from the position of the incomplete penetration defect.

The seventh step: and cleaning metal residues of the gouging groove by adopting a small hammer and a steel wire brush.