CN-118699727-B - Full penetration welding method for welding groove of bent cover plate of hydraulic support

CN118699727BCN 118699727 BCN118699727 BCN 118699727BCN-118699727-B

Abstract

The invention discloses a full penetration welding method of a groove weld of a bent cover plate of a hydraulic support, which relates to the technical field of full penetration welding of groove weld, and comprises the following steps of blanking; the welding method has the advantages that the size of the groove is stable through control of the angle of the groove of the bent cover plate, the angle of the bent cover plate and the angle of assembly with the front transverse rib plate, the cover plate assembly position line is scribed on the front transverse rib plate before the welding, the position of the welding overlay is ensured to be accurate, welding leakage is avoided in the bottoming welding process through the bearing function of the welding overlay, the welding overlay can be operated in batches through a robot welding mode, the operation is simple, the efficiency is high, the welding overlay is welded by the robot, the height, the width and the straightness of the welding overlay are stable, the bearing quality is improved, the starting end of the bottoming welding seam adopts the arcing parameter, and the welding mode of welding wire backswing rotation is adopted at the tail end of the bottoming welding seam, so that arcing and arcing cracks are avoided.

Inventors

LIU CHENG
LAN ZHIYU
LI ZHENG
WANG DONG
CHEN MING
WANG PIAOYANG
Shou Chenpeng
GUO WEIMIN

Assignees

郑州煤矿机械集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20240802

Claims (6)

1. A full penetration welding method for a welding line of a bevel of a bent cover plate of a hydraulic support is characterized by comprising the following steps: Step S1, blanking: Cutting and blanking parts such as a top beam cover plate (1) and a front transverse rib plate (4) by using a plasma or laser cutting machine; Step S2, cutting grooves: cutting the bevel of the cover plate (1) according to a drawing by using a bevel cutting machine; step S3, bending: Placing a workpiece on a three-point positioning bending platform, finding the bending position of a top beam cover plate (1) by using an upper tire mould (2) with R=75mm, and performing downward pressing bending on the top beam cover plate (1); step S4, overlaying (5): grinding the positions with welding beads and two sides on the front transverse rib plate (4) by adopting a grinder to leak metallic luster, scribing an assembling position line of the cover plate (1) on the front transverse rib plate (4), and overlaying (5) one step below the assembling position line of the cover plate (1) by utilizing a welding robot, wherein the overlaying (5) adopts ER50-6 welding wires with diameter phi of 1.6mm, and the welding parameters are welding current of 440-480A, welding voltage of 25-28V, wire feeding speed of 9m/min and welding speed of 60-70cm/min; and S5, splicing: Polishing the positions of the front transverse rib plate (4) and the bending cover plate (1) with weld beads to obtain metallic luster by adopting a grinder, and adjusting the relative positions of the bending cover plate (1) and the front transverse rib plate (4) by utilizing a tool; step S6, robot backing welding: Fixing a top beam to be welded on a welding platform, integrally backing welding a groove between a front transverse rib plate (4) and a bent cover plate (1) by adopting a robot, performing shielded welding by adopting mixed gas of Ar+20% CO2, wherein the gas flow is 25-30L/min, the welding speed is 50-60cm/min, the welding wire is stretched by 30-35mm in a dry way, the included angle between the top beam and the front transverse rib plate (4) is 13-15 degrees, the welding running angle is 5-10 degrees, the starting end of the backing welding seam is 2-3mm, the arc starting parameter is 200-220A, the voltage is 21-22V, the wire feeding speed is 3-4m/min, the welding speed is 20-25cm/min, the welding parameters of the middle section of the backing welding seam are 420-450A, the welding voltage is 32-34V, the wire feeding speed is 9.5-10m/min, the welding speed is 50-60cm/min, the sinusoidal swing is 1mm, the welding end is 3-5mm in a double-side swing is 1mm, the arc receiving parameter is adopted, the current is 180-200A, the voltage is 20-21V, the wire feeding speed is 3-3.5 cm/min, and the arc returning speed is 20cm/min, and the arc returning speed is full, and the arc is full in the arc rotating process; Step S7, robot filling and cover welding: filling a first layer, namely welding only 1 layer, wherein welding parameters comprise welding current 420-450A, welding voltage 30-33V, wire feeding speed 7-9m/min, welding speed 45-55cm/min, adopting an upward-inclined 15-degree oblique upward-swinging mode, and bilateral swinging width 4mm; Filling welding parameters of the rest, namely, welding current of 360-430A, welding voltage of 30-33V, wire feeding speed of 7-10m/min, welding speed of 45-55cm/min, sinusoidal oscillation and bilateral oscillation width of 2-5mm; The welding parameters of the cover surface are 350-380A of welding current, 29-31V of welding voltage, 6-8m/min of wire feeding speed, 45-65cm/min of welding speed and 2-6mm of double-sided swing width.
2. The full penetration welding method for the bevel weld of the bent cover plate of the hydraulic support, which is disclosed in claim 1, is characterized in that in the step S2, the bevel angle of the front end of the top beam cover plate (1) is ensured to be 55 degrees, and the blunt edge is 1-2mm.
3. The full penetration welding method of the bevel weld of the bent cover plate of the hydraulic support, which is disclosed in claim 1, is characterized in that in the step S3, the bending radius of the top beam cover plate (1) is unified to be R=80 mm, and the bending angle is controlled to be 15 degrees+/-1 degrees.
4. The full penetration welding method for the groove weld of the bent cover plate of the hydraulic support, which is disclosed in claim 1, is characterized in that in the step S4, the height of the welded weld is guaranteed to be 4-6mm, the distance between two ends of the weld and the plate edge of the transverse rib plate is 1-2mm, and the distance between the edge of the weld and the assembly position line of the cover plate (1) is 1-3mm.
5. The full penetration welding method for the groove weld of the bent cover plate of the hydraulic support, which is disclosed in claim 1, is characterized in that in the step S5, the gap between the groove root and the upper edge of the build-up welding (5) is ensured to be 1-3mm, and the gap between the groove root and the front transverse rib plate (4) is ensured to be 0-2mm.
6. The full penetration welding method for the groove weld of the bent cover plate of the hydraulic support, which is disclosed in claim 1, is characterized in that in the step S7, the welding wire is kept to be stretched 20-30mm in a dry mode during welding, the included angle between the welding wire and the front transverse rib plate (4) is 13-15 degrees, and the welding traveling angle is 5-10 degrees.

Description

Full penetration welding method for welding groove of bent cover plate of hydraulic support Technical Field The invention relates to the technical field of full penetration welding of groove welding seams, in particular to a full penetration welding method of a groove welding seam of a bent cover plate of a hydraulic support. Background The hydraulic support is main equipment for mining coal mines, and structural components are key bearing components of the hydraulic support and play a role in directly bearing the pressure of a mine surface. The hydraulic support structure has the characteristics of complex structure, large welding amount, large bearing capacity and the like, and the hydraulic support structure is a customized product and has the characteristics of small batch and multiple batches. The top beam is one of the important parts of the structural member and is generally formed by splicing and welding high-strength steel parts such as a main rib assembly, a rib plate, a cover plate and the like. The welding seam forms of all parts on the top beam mainly comprise fillet welds and groove welds, wherein the groove welds formed between the bending cover plate and the front transverse main reinforcement plate are large in depth and large in welding quantity, multiple layers and multiple channels of welding are needed, the thickness of the steel plate is large, the groove position is low, the cover plate is provided with bending angles, the welding seam is complex, and the welding difficulty is large. The traditional welding process of the bevel of the bending cover plate of the top beam of the hydraulic support comprises the following steps of blanking, bevel cutting, bending of the cover plate, assembly, manual backing welding, robot filling and capping welding, wherein the technical scheme is as follows: and (3) blanking: cutting and blanking parts such as a top beam cover plate, a front transverse rib plate and the like by using a cutting machine; and (2) cutting a groove: Cutting the bevel of the top beam cover plate according to the drawing by using a bevel cutting machine, and ensuring the blunt edge to be 1-2mm; and (2) bending: the bending method comprises the steps of using a tool to find a bending position of a top beam cover plate, and using a bending machine to bend the top beam cover plate; assembling: grinding the positions of the front transverse rib plate and the bending cover plate, which are provided with welding beads, by adopting a grinder, and adjusting the relative positions of the bending cover plate and the front transverse rib plate by utilizing a tool; welding in the step (4): And fixing the top beam to be welded on a welding platform, and welding on backing welding by using a robot. The prior art has the following defects: (1) The bending radius and angle of the bent cover plate are inconsistent, so that bending moulds of each batch of workpieces are different, the production is difficult, and the precision is poor; (2) The cover plate is bent by pressing and has larger influence on the assembly precision, and the bevel angle is inconsistent with the root gap, so that the dimensional precision of a bevel weld formed by the bent cover plate and the rib plate is poor, the gap is inconsistent, and the bevel gap generally irregularly changes between 1mm and 4 mm; (3) The adaptability of the robot welding parameters to the groove weld seam between the bent cover plate and the transverse rib plate is poor, the welding parameters are large, the groove weld seam is easy to leak, a cavity is formed, the welding parameters are small, the root cannot be welded through, the cavity is formed, and the two sides are easy to form unfused defects. Disclosure of Invention The invention aims to solve the problems and provide a full penetration welding method for a groove weld of a bent cover plate of a hydraulic bracket. The invention realizes the above purpose through the following technical scheme: a full penetration welding method for a welding line of a bevel of a bent cover plate of a hydraulic support comprises the following steps: Step S1, blanking: cutting and blanking parts such as a top beam cover plate, a front transverse rib plate and the like by using a plasma or laser cutting machine; Step S2, cutting grooves: cutting a cover plate groove according to a drawing by using a groove cutting machine; step S3, bending: placing a workpiece on a three-point positioning bending platform, finding the bending position of a top beam cover plate by using an upper tire mold with R=75mm, and performing downward bending and bending on the top beam cover plate; step S4, overlaying: polishing the positions with a welding bead and two sides on the front transverse rib plate by adopting a grinder, leaking out metallic luster, scribing a cover plate assembly position line on the front transverse rib plate, and overlaying one pass below the cover plate assembly position line by utilizing a welding rob