CN103143818A - Single-pass multilayer welding device and method for medium plate - Google Patents

Abstract

The invention belongs to the technical field of welding technologies in material processing engineering, and relates to a single-pass multilayer welding device and a method for a medium plate, in particular to a single-pass multilayer GMAW (Gas Metal Arc Welding) method and a device for a 30-45mm thick medium plate. The device comprises a welding gun, a swing structure and a control system, wherein a welding joint groove is in a V-shaped belt backing plate groove form; an angle is 5-8 degrees; the gap width is 8-15mm; welding shielding gas adopts mixed gas of carbon dioxide and argon; a gas flow is 20-25L/min; and a metal transfer form during a welding course is spray transfer. The device and the method have the advantages that the welding efficiency of the medium plate can be improved effectively by the single-pass multilayer welding method, a side wall fusion effect can be improved by controlling arc swing, and the welding quality can be improved.

Description

A kind of cut deal single track multilayer welding connection device and method

Technical field

The present invention relates to a kind of cut deal single track multilayer welding connection device and method.

Background technology

According to " 2011 China Steel industry yearbook ", the existing heavy and medium plate mill total productive capacity of China is 9,331 ten thousand t/a, produced altogether cut deal 7,221 ten thousand t in 2010, these cut deals are widely used in the industries such as shipbuilding, pressure vessel, bridge, skyscraper, nuclear power.

The traditional welding method of slab generally adopts multi-pass welding.Along with the thickness of workpiece increases gradually, traditional method shows significant limitation.Because welding construction material intensity is high, its weldability is relatively poor, needs weld preheating, and wlding is thick, and structure is large, brings a lot of difficulties to preheating, and the welding working condition is poor, length consuming time.And traditional welding method heat input is large, the heat affected area is wide, coarse grains, under the acting in conjunction of the large constraint degree of slab and a large amount of filling metal freezing convergent forces, welding point exists larger residual stress and welding deformation, welding joint mechanical property is poor, the weld defect such as easily cracks.The high strength steel structures that adopt during modern industry is produced more, the rigidity of this structure is large, and the residual stress that Produced after Welding is very high in case distortion is difficult to correct, therefore need to weld under lower heat input, and this will cause welding efficiency to reduce.

Summary of the invention

The object of the present invention is to provide a kind of cut deal single track multilayer welding connection device and method, but it has advantages of that welding efficiency is high and welding quality is good.

the present invention is achieved like this, a kind of cut deal single track multilayer welding connection device, it comprises computer, motion controller, robot, swing mechanism, welding gun, welding machine and cable, swing mechanism also comprises encoder, motor, decelerator, force bearing plate, swing connecting bar, engaging lug and fixed head, it is characterized in that swing mechanism is by encoder, motor, decelerator, force bearing plate, swing connecting bar, engaging lug and fixed head consist of, wherein the top of motor is connected with encoder, the bottom of motor is connected with decelerator, motor and decelerator are fixed on force bearing plate by bolt arrangement, the right-hand member of force bearing plate is connected with joint, robot end, swing connecting bar one end is fixedly connected with reducer output shaft with bolt arrangement by key, the other end is connected with engaging lug by bolt, fixed head one side is connected with engaging lug by bolt, opposite side is connected with welding gun by bolt, encoder on swing mechanism is connected with motion controller by cable, and welding gun is connected with welding machine by cable.Described computer is connected by the DR9 interface with the communication of motion controller; Described welding gun is the crank welding gun; Described welding method is that welding point sheet metal thickness size range is 30 ~ 45mm, and the grooves of welding joints form is V-belt backing plate groove, and angle is 5 ° ~ 8 °, and gap width is 8 ~ 15mm; Adopt the GMAW welding manner, welding method comprises the steps:

(1) prepare before the weldering: clear up impurity and the oxide-film of workpiece to be welded two side, be mounted with on workbench;

(2) welding: protection-gas welding adopts the mist of carbon dioxide and argon gas, gas flow is 20 ~ 25L/min, the welding method of single track multilayer is adopted in welding, and in welding process, mode of metal transfer is spray transfer, and ignition tip and surface of the work keep the angle of 10 ° ~ 20 °; Welding condition is: arc voltage 27 ~ 32V, welding current 270 ~ 300A, speed of welding 27 ~ 30cm/min; Every layer is soldered rear trimming surface, then carries out lower one deck welding.

Technique effect of the present invention is: the present invention can effectively improve the welding efficiency of cut deal by the welding method of single track multilayer, can improve the sidewall fusion effect by the swing of controlling electric arc, improves welding quality.

Description of drawings

Fig. 1 is the structural representation of apparatus of the present invention.

Fig. 2 is the structural representation of swing mechanism.

Fig. 3 is the movement locus of welding wire end.

Computer 2, motion controller 3, robot 4, swing mechanism 5, welding gun 6, welding machine 7, cable 8, encoder 9, motor 10, decelerator 11, force bearing plate 12, swing connecting bar 13, engaging lug 14, fixed head in the drawings, 1.

The specific embodiment

as depicted in figs. 1 and 2, the present invention is achieved like this, it comprises computer 1, motion controller 2, robot 3, swing mechanism 4, welding gun 5, welding machine 6 and cable 7, swing mechanism 4 also comprises encoder 8, motor 9, decelerator 10, force bearing plate 11, swing connecting bar 12, engaging lug 13 and fixed head 14, its design feature is that swing mechanism 4 is by encoder 8, motor 9, decelerator 10, force bearing plate 11, swing connecting bar 12, engaging lug 13 and fixed head 14 consist of, wherein the top of motor 9 is connected with encoder 8, the bottom of motor 9 is connected with decelerator 10, motor 9 and decelerator 10 are fixed on force bearing plate 11 by bolt arrangement, the right-hand member of force bearing plate 11 is connected with robot 3 last joint, swing connecting bar 12 1 ends are fixedly connected with decelerator 10 output shafts with bolt arrangement by key, the other end is connected with engaging lug 13 by bolt, fixed head 14 1 sides are connected with engaging lug 13 by bolt, opposite side is connected with welding gun 5 by bolt, encoder 8 on swing mechanism 4 is connected with motion controller 2 by communication cable, and the cable 7 that passes through of welding gun 5 is connected with welding machine 6.Described computer 1 is connected by the DR9 interface with the communication of motion controller 2; Described welding gun 5 is the crank welding gun;

Robot 3 controls path of welding in welding process, swing mechanism 4 is controlled the swing of electric arc in welding process, by the cooperative motion of robot 3 and swing mechanism 4, realize that electric arc reciprocally swinging in weld gap advances during welding, thereby the single track of realizing cut deal is shaped.

Output shaft by decelerator 10 drives swing mechanism 4 and rotates, and then drives the swing of welding gun 5, not stopping to change and realize that electric arc is in the continuous swing in gap by motor 9 positive-negative rotation states.Encoder 8 is installed on motor 9, is used for recording the motor rotation state.In swing process, the operating condition of motor 9 is real-time transmitted to computer 1 through motion controller 2, and computer 1 sends signal by software systems, changes the operating condition of motor 9 through motion controller 2.Computer 1 passes through the DR9 interface with the communication of motion controller 2.

Welding method, described welding point sheet metal thickness size range is 30 ~ 45mm.The grooves of welding joints form is V-belt backing plate groove, and angle is 5 ° ~ 8 °, and gap width is 8 ~ 15mm;

Adopt the GMAW welding manner, welding method comprises the steps:

Prepare before A, weldering: clear up impurity and the oxide-film of workpiece to be welded two side, need not preheating, be mounted with on workbench;

B, welding: protection-gas welding adopts the mist of carbon dioxide and argon gas, and gas flow is 20 ~ 25L/min, and the welding method of single track multilayer is adopted in welding.In welding process, mode of metal transfer is spray transfer.Welding condition is: arc voltage 27 ~ 32V, welding current 270 ~ 300A, speed of welding 27 ~ 30cm/min.Every layer is soldered rear trimming surface, then carries out lower one deck welding.

Fig. 3 is the movement locus figure of welding wire end, and the movement locus of welding wire is the coupling path of welding direction and swaying direction.In order to guarantee the fusion of sidewall, so stop 0.2 ~ 0.3ms when wire oscillation arrives the two side, therefore only has the motion of welding direction when cut deal single track multilayer welding.In order to prove absolutely characteristic of the present invention, the below provides the actual welding example.Proceed to the back welding experiment for Q235 mild steel, groove is V-belt backing plate groove, and bevel angle is 12 °, and gap width is 14mm, and the sidewall height is 35mm.Protection gas is 20%Ar+80%CO2, and flow is 20L/min.Welding current is 285A, and weldingvoltage is 30.1V, and speed of welding is 25cm/min, and the amplitude of oscillation is 6, and the sidewall time of staying is 0.25s.By observing weld appearance figure and the weld seam macroscopic cross section figure of welding result, can find out that sidewall fusion is effective, face of weld is smooth, without splashing.

Claims (3)

1. cut deal single track multilayer welding connection device, it comprises computer, motion controller, robot, swing mechanism, welding gun, welding machine and cable, swing mechanism also comprises encoder, motor, decelerator, force bearing plate, swing connecting bar, engaging lug and fixed head, it is characterized in that swing mechanism is by encoder, motor, decelerator, force bearing plate, swing connecting bar, engaging lug and fixed head consist of, wherein the top of motor is connected with encoder, the bottom of motor is connected with decelerator, motor and decelerator are fixed on force bearing plate by bolt arrangement, the right-hand member of force bearing plate is connected with joint, robot end, swing connecting bar one end is fixedly connected with reducer output shaft with bolt arrangement by key, the other end is connected with engaging lug by bolt, fixed head one side is connected with engaging lug by bolt, opposite side is connected with welding gun by bolt, encoder on swing mechanism is connected with motion controller by cable, and computer is connected by the DR9 interface with the communication of motion controller, and welding gun is connected with welding machine by cable.

2. a kind of cut deal single track multilayer welding connection device according to claim 1, is characterized in that described welding gun is the crank welding gun.

3. a kind of cut deal single track multilayer welding method according to claim 1, is characterized in that welding point sheet metal thickness size range is 30 ~ 45mm, and the grooves of welding joints form is V-belt backing plate groove, and angle is 5 ° ~ 8 °, and gap width is 8 ~ 15mm; Adopt the GMAW welding manner, welding method comprises the steps:

(1) prepare before the weldering: clear up impurity and the oxide-film of workpiece to be welded two side, be mounted with on workbench;

(2) welding: protection-gas welding adopts the mist of carbon dioxide and argon gas, gas flow is 20 ~ 25L/min, the welding method of single track multilayer is adopted in welding, and in welding process, mode of metal transfer is spray transfer, and ignition tip and surface of the work keep the angle of 10 ° ~ 20 °; Welding condition is: arc voltage 27 ~ 32V, welding current 270 ~ 300A, speed of welding 27 ~ 30cm/min; Every layer is soldered rear trimming surface, then carries out lower one deck welding.

Images