A welding and shaping process suitable for the outer gantry column of a stacker

Abstract

The application discloses a welding and shape adjusting process suitable for a pile height machine outer gantry stand column, which comprises the following steps: S1, assembling a pile height machine outer gantry stand column; S2, welding the pile height machine outer gantry stand column; S3, correcting the deformation in the width direction of the web plate by flame once; S4, correcting the deformation in the length direction of the web plate by machinery once; S5, correcting the deformation in the length direction of the wing plate by flame twice; and S6, correcting the local deformation of the stand column by machinery twice. The welding process, the flame correction process and the machinery correction process are improved, the welding deformation problem of the pile height machine outer gantry stand column is effectively improved and solved, the overall flatness and straightness of the pile height machine outer gantry stand column are less than or equal to 2 mm, and the drawing and assembly requirements are met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of welding forming, and particularly relates to a welding and forming process suitable for a stacker outer gantry column. BACKGROUND

[0002] The empty container stacker is a key equipment for container transportation, and is widely used in the stacking and transfer of containers in ports, wharfs, railway and highway transfer stations and yards, has the characteristics of high stacking layer, high operation efficiency and flexible maneuvering, and common empty container stackers have a lifting height of up to 19 m, 7 stacking layers and a gantry height of 10 m. The stacker gantry is an important structure of the stacker, which is composed of an inner gantry and an outer gantry. The outer gantry column is an important part of the stacker gantry, and the welding quality and dimensional accuracy of the outer gantry column are important factors affecting the quality of the gantry structure.

[0003] The stacker outer gantry column is a main force structure of the stacker gantry, which is welded and processed from one web plate and two wing plates, as shown in FIG. Figure 1 Due to the narrow and long stacker outer gantry column, the deformation after welding is large, and the size is out of tolerance, which is difficult to meet the size (overall flatness and straightness ≤2 mm) and assembly requirements of the drawing. At present, the welding deformation processing problem of such structure has become a common problem in the industry.

[0004] In order to improve and correct the welding deformation of the stacker outer gantry column, the common methods include adjusting the welding sequence, post-welding flame correction or mechanical correction.

[0005] The weld of the stacker outer gantry column is a long straight weld, which will produce a large welding deformation after welding. Adjusting the welding sequence can effectively improve the welding deformation, but no matter how to adjust the welding process and welding sequence, the stacker outer gantry column will produce a serious deformation after welding, which does not meet the requirement of flatness and straightness ≤2 mm of the stacker outer gantry column, and the column needs to be corrected.

[0006] The common correction methods include mechanical correction and flame correction. The mechanical correction is to press the workpiece deformation position by using a press machine, so that the workpiece produces plastic deformation in the opposite direction of the deformation, which has high efficiency but is not suitable for irregular surface correction of the workpiece. If only the mechanical correction method is used, repeated pressing on the workpiece will reduce the plasticity of the workpiece. The flame correction is to heat the workpiece to produce plastic compression to offset the welding deformation, which has low efficiency but is suitable for irregular workpieces. If only the flame correction method is used, not only the efficiency is low, but also the risk of local hardening of the workpiece is increased.

[0007] In summary, the existing technology cannot meet the dimensional accuracy requirements of the stacker outer gantry column. SUMMARY

[0008] Invention purposes: In order to solve the defects of the prior art, the present application provides a welding and shaping process suitable for the outer gantry column of the stacker, the welding process is adjusted to improve the welding deformation of the outer gantry column of the stacker; after welding is completed, the column size (flatness and straightness ≤2mm) is adjusted by using the shaping method combining flame correction and mechanical correction; the reasonable welding and shaping process is designed to realize the welding deformation control and correction of the outer gantry column structure of the stacker.

[0009] Technical scheme: The welding and shaping process suitable for the outer gantry column of the stacker disclosed by the present application comprises the following steps:

[0010] S1, the outer gantry column of the stacker is assembled;

[0011] The outer gantry column of the stacker is assembled, and the column is formed by the web plate, the front wing plate and the rear wing plate, and the F-shaped section is formed, the web plate is placed on the assembly platform, the front wing plate and the rear wing plate are marked and assembled based on the web plate, and the reinforcement bar is assembled;

[0012] S2, the outer gantry column of the stacker is welded;

[0013] The first weld is formed on the back of the web plate, the second weld is formed on the front of the web plate, the third weld and the fourth weld are formed on the front of the web plate, and the first weld, the second weld, the third weld and the fourth weld are sequentially subjected to backing welding; after the backing welding is completed, the second weld is sequentially subjected to filling welding, the first weld is subjected to filling and surface welding, the third weld and the fourth weld are subjected to filling welding, and the second weld, the third weld and the fourth weld are subjected to surface welding;

[0014] During welding of each weld, the welding sequence of divided middle section symmetry or segmented back welding is adopted, and after welding is completed and the workpiece is completely cooled, the reinforcement bar is removed;

[0015] S3, one-time flame correction of the width direction deformation of the web plate;

[0016] The web plate of the column is upward, the straightness in the width direction thereof is measured, the deformation amount is determined, the first flame heating area, the second flame heating area and the third flame heating area are drawn on the web plate, the first flame heating area is located on the upper side of the fourth weld, the second flame heating area is located on the upper side of the first weld, the third flame heating area is located on the upper side of the fourth weld, the flame gun is opened and the three heating areas are sequentially heated, and after cooling after heating is completed, the flatness in the width direction is measured again;

[0017] S4, one-time mechanical correction of the length direction deformation of the web plate;

[0018] The column is hoisted to the press platform, the web deformation position is determined, the web is placed downward on the interval arranged lower pad, the upper pad is placed at the deformation position, the press head is aligned to the upper pad, pressure is applied, and the shaping deformation is completed by pressing;

[0019] S5, two times of flame correction wing plate length direction deformation;

[0020] The column is hoisted to the assembly platform, the straightness of the rear wing plate is measured, the deformation starting position and the deformation amount are determined, the fifth flame heating area and the sixth flame heating area are drawn on the web, the sixth flame heating area and the fifth flame heating area are heated in turn, the fifth flame heating area is located at the deformation starting point, and the sixth flame heating area is spaced apart from the fifth flame heating area; after heating and cooling, the straightness of the rear wing plate is measured again;

[0021] S6, two times of mechanical correction of local deformation of the column;

[0022] The column is hoisted to the press platform, the local deformation position of the front wing plate is determined, the first pad and the second pad are arranged below the web on both sides of the local deformation position and extend to below the third weld, the press head is aligned to the local deformation position of the front wing plate, pressure is applied, and sufficient plastic deformation is performed, after pressing is completed, the press head, the first pad and the second pad are removed, the straightedge is placed on the front wing plate, and the straightedge is moved constantly to determine the deformation position and perform shaping by applying pressure again.

[0023] In S1, the web plate thickness is 25mm, the front wing plate thickness is 40mm, the rear wing plate thickness is 40mm, the material is Q345B, and the reinforcement spacing is 1m.

[0024] Further, in S2, the welding process parameters are: current 260-300A, voltage 26-30V, welding speed 300-500mm / min, welding wire specification ER50-6, welding wire diameter φ1.2mm, and protective gas 80%Ar+20%CO2.

[0025] Further, S3 adopts a linear heating method, the first flame heating area has a width of 30-40mm, the flame gun has a travel speed of 200-300mm / min; the second flame heating area has a width of 30-40mm, the flame gun has a travel speed of 200-300mm / min; the third flame heating area has a width of 50-60mm, the flame gun has a travel speed of 150-200mm / min, the flame gun advances in a circle drawing method, the flame shaping temperature is 500-650℃, and the flame gun uses oxygen-natural gas.

[0026] Further, in S4, the straight ruler is placed on the web plate, and the straight ruler is moved constantly to determine the deformation position of the web plate; after the pressing is completed, the press head and the upper pad plate are removed, the straight ruler is placed on the web plate, and the straight ruler is moved constantly to determine the deformation position, and the shaping is performed again by pressing until the straightness of the length direction of the web plate of the outer gantry column of the stacker meets the requirements.

[0027] Further, in S5, the straightness of the rear wing plate is measured by the pull line.

[0028] Further, in S5, the second time of flame adopts an isosceles triangle area heating mode, the bottom end point of the fifth flame heating area is located at the deformation starting point, and the bottom of the sixth flame heating area is spaced from the bottom of the fifth flame heating area.

[0029] Further, in S5, the size of the flame heating area is determined by the deformation amount of the rear wing plate, when the deformation amount of the rear wing plate is 2-10mm, the fifth flame heating area has a bottom side of 90-110mm and a height of 120-140mm, the sixth flame heating area has a bottom side of 140-160mm and a height of 190-210mm, and the distance between the bottom sides of the fifth flame heating area and the sixth flame heating area is 50-100mm; when the deformation amount of the rear wing plate is 10-20mm, the fifth flame heating area has a bottom side of 120-140mm and a height of 160-180mm, the sixth flame heating area has a bottom side of 190-210mm and a height of 240-260mm, and the distance between the bottom sides of the fifth flame heating area and the sixth flame heating area is 50-100mm.

[0030] Further, in S5, the flame heating path is heating from the outer periphery of the triangle to the center or heating from the bottom side of the triangle to the top point back and forth, the flame gun advances in a circle to ensure uniform heating, and the flame shaping temperature is 500-650℃.

[0031] Further, in S6, the third pad plate is placed below the local deformation position, the fourth pad plate is placed at the deformation position of the front wing plate, pressure is applied for shaping, and the same method is repeated to perform pressure shaping on the rear wing plate until the overall flatness of the outer gantry column of the stacker is ≤2mm.

[0032] Beneficial effects: relative to the prior art, the present application effectively improves and solves the problem of welding deformation of the outer gantry column of the stacker by improving the welding process, flame correction and mechanical correction process, so that the overall flatness and straightness of the outer gantry column of the stacker is ≤2mm, meeting the drawing and assembly requirements; by adopting the sequence of symmetrical welding in the middle section and segmented back welding, the welding deformation is reduced; by combining the advantages of mechanical correction and flame correction methods, the problem of post-welding deformation of the outer gantry column of the stacker is effectively solved (for example, using mechanical correction alone, repeated correction will reduce its plasticity; using flame correction alone not only has low efficiency, but also has difficulty in controlling the amount of flame deformation correction and increases the risk of local hardening), the mechanical correction and flame correction are combined, the efficiency is improved, and the influence of plasticity reduction and local hardening caused by post-welding correction on the column quality is maximized.

[0033] The process method is not only suitable for the outer gantry column of the stacker, but also can be used for similar structural parts of the outer gantry of the forklift. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure diagram of the outer gantry column of the stacker of the prior art;

[0035] Figure 2 It is a structure diagram of the outer gantry column of the stacker of the present application;

[0036] Figure 3 It is a schematic diagram of the welding seam of the outer gantry column of the stacker of the present application;

[0037] Figure 4 It is a schematic diagram of the symmetrical welding sequence in the middle section of the present application;

[0038] Figure 5 It is a schematic diagram of the segmented back welding sequence of the present application;

[0039] Figure 6 It is a schematic diagram of the post-welding deformation of the outer gantry column of the stacker of the present application;

[0040] Figure 7 It is a schematic diagram of one-pass flame heating correction of the present application;

[0041] Figure 8 It is a schematic diagram of the deformation after one-pass flame heating correction of the present application;

[0042] Figure 9 It is a schematic diagram of one-pass mechanical correction of the present application;

[0043] Figure 10 It is a schematic diagram of the deformation after one-pass mechanical correction of the present application;

[0044] Figure 11 It is a schematic diagram of two-pass flame correction of the present application;

[0045] Figure 12 This is a schematic diagram of the second flame heating path of the present invention;

[0046] Figure 13 This is a schematic diagram of deformation after two-pass flame heating of the present invention;

[0047] Figure 14 This is a schematic diagram of the two-pass mechanical correction process of the present invention;

[0048] Figure 15 This is a schematic diagram of the workpiece after two-pass mechanical correction according to the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0050] A welding and shaping process for a forklift outer door frame column includes the following steps:

[0051] S1, Assemble the outer mast columns of the forklift;

[0052] like Figure 2 As shown, it includes a web 11 (25mm thick), a front wing 12 (40mm thick), and a rear wing 13 (40mm thick), all made of Q345B with an F-shaped cross-section. The web 11 is placed on the assembly platform. Using the web 11 as a reference, the front wing 12 and rear wing 13 are marked and assembled, along with tie bars, with a 1-meter interval between the bars.

[0053] S2. Welding forklift outer mast columns;

[0054] like Figure 3 As shown, the front wing panel 12 forms a first weld 21 on the back side of the web 11 and a second weld 22 on the front side of the web 12 , and the rear wing panel 13 forms a third weld 23 and a fourth weld 24 on the front side of the web 11 .

[0055] Place the column on the jointing platform with the web 11 facing upward. First, perform the bottom weld on the first weld 21. Then, flip the column 180° and perform the bottom weld on the second weld 22, the third weld 23, and the fourth weld 24. After the bottom weld is completed, fill the second weld 22. Then, flip the column 180° and perform the fill and cover weld on the first weld 21. Flip the workpiece 180° again and perform the fill weld on the third weld 23 and the fourth weld 24. After the fill weld is completed, perform the cover weld on the second weld 22, the third weld 23, and the fourth weld 24.

[0056] like Figure 4 and 5 As shown, when welding each weld, a welding sequence of symmetrical middle section or segmented back-welding is adopted. After welding is completed and the workpiece is completely cooled, the tie rods are removed.

[0057] Welding process parameters: current 260 A, voltage 26 V, welding speed 300 mm / min, welding wire specification ER50-6, welding wire diameter φ1.2 mm, shielding gas 80% Ar + 20% CO2, welding machine YD-500FR2.

[0058] S3, one-pass flame correction of the web width direction deformation;

[0059] For the post-weld deformation of the outer gantry column of the stacker as shown in Figure 6 .

[0060] As shown in Figure 7 , place the web 11 of the outer gantry column of the stacker upwards on the splicing platform. Use a 1-meter steel ruler to measure the straightness of the web 11 in the width direction to determine the deformation amount.

[0061] After the measurement is completed, use a stone pen to draw the first flame heating area 31, the second flame heating area 32, and the third flame heating area 33 on the web 11, the first flame heating area 31 is located on the upper side of the fourth weld 24, the second flame heating area 32 is located on the upper side of the first weld 21, and the third flame heating area 33 is located on the upper side of the fourth weld 24. Heat the three heating areas in turn using a flame gun, and after cooling after heating is completed, measure the flatness in the width direction again.

[0062] The one-pass flame shaping of the outer gantry column of the stacker uses linear heating, the first flame heating area 31 has a width of 30 mm, the flame gun advances at a speed of 200 mm / min; the second flame heating area 32 has a width of 30 mm, the flame gun advances at a speed of 200 mm / min; the third flame heating area 33 has a width of 50 mm, the flame gun advances at a speed of 150 mm / min, the flame gun advances in a circle drawing method, the flame shaping temperature is 500℃, and the flame gun uses oxygen-natural gas. The flame shaping width can be adjusted according to the web thickness and material.

[0063] After correction, as shown in Figure 8 .

[0064] S4, one-pass mechanical correction of the web length direction deformation;

[0065] As shown in Figure 9 , hoist the outer gantry column of the stacker to the press platform, place the straight ruler on the web 11, and constantly move the straight ruler to determine the deformation position of the web 11. Place the web 11 downwards on the lower spacer plate 41 arranged at intervals, place the upper spacer plate 42 at the deformation position, align the pressure head 43 of the press with the upper spacer plate 42, and apply pressure to ensure sufficient plastic deformation.

[0066] After the pressing is completed, the press head 43 and the upper pad plate 42 are removed, the straight ruler is placed on the web plate 11, the straight ruler is continuously moved, the deformation position is determined, and the shaping is performed again, until the straightness of the web plate 11 in the length direction of the outer gantry column of the stacker meets the requirements.

[0067] After correction, as Figure 10 shown.

[0068] S5, two times of flame correction of the length direction of the wing plate;

[0069] As Figure 11 shown, the outer gantry column of the stacker is lifted from the press to the splicing platform, the straightness of the rear wing plate 13 is measured by the pull line, the deformation starting position and the deformation amount are determined.

[0070] After the measurement is completed, the fifth flame heating area 51 and the sixth flame heating area 52 are drawn on the web plate 11 by using a stone pen, the sixth flame heating area 52 and the fifth flame heating area 51 are heated in sequence, the fifth flame heating area 51 is located at the deformation starting point, and the sixth flame heating area 52 is spaced apart from the fifth flame heating area 51; after the heating is completed and cooled, the straightness of the rear wing plate 13 is measured again.

[0071] An isosceles triangle area heating mode is adopted, the bottom end point of the fifth flame heating area 51 is located at the deformation starting point, and the bottom of the sixth flame heating area 52 is spaced apart from the bottom of the fifth flame heating area 51.

[0072] The size of the flame heating area is determined by the deformation amount of the rear wing plate 13, when the deformation amount of the rear wing plate 13 is 2-10 mm, the fifth flame heating area 51 has a bottom edge of 90 mm and a height of 120 mm, the sixth flame heating area 52 has a bottom edge of 140 mm and a height of 190 mm, and the bottom edge interval between the fifth flame heating area 51 and the sixth flame heating area 52 is 50 mm; when the deformation amount of the rear wing plate 13 is 10-20 mm, the fifth flame heating area 51 has a bottom edge of 120 mm and a height of 160 mm, the sixth flame heating area 52 has a bottom edge of 190 mm and a height of 240 mm, and the bottom edge interval between the fifth flame heating area 51 and the sixth flame heating area 52 is 50 mm.

[0073] As Figure 12 shown, the flame heating path is heating from the outer periphery of the triangle to the center or heating back and forth from the bottom edge of the triangle to the top point, the flame gun advances in a circle to ensure uniform heating, the flame shaping temperature is 500-650℃, and the flame shaping width can be appropriately adjusted according to the thickness of the web plate and the material.

[0074] S6, two times of mechanical correction of local deformation of the column;

[0075] For Figure 13The two-pass flame heating deformed stacker outer gantry column is shown.

[0076] As Figure 14 The stacker outer gantry column is hoisted to the press platform with the web plate 11 facing down, and the straight ruler is placed on the front wing plate 13. The straight ruler is moved constantly to determine the local deformation position of the front wing plate 13.

[0077] The first and second pads 61 and 62 are arranged below the web plate 11 and on both sides of the local deformation position and extend to below the third weld 23. The press head 43 of the press is aligned with the local deformation position of the front wing plate 13, and pressure is applied to fully plastically deform. After the pressing is completed, the press head 43, the first pad 61 and the second pad 62 are removed, the straight ruler is placed on the front wing plate 13, and the straight ruler is moved constantly to determine the deformation position to press again for shaping.

[0078] If the pressing depth is too large, the third pad 63 is placed below the local deformation position, and the fourth pad 64 is placed at the deformation position of the front wing plate 13 to apply pressure for shaping. The same method is repeated to press and shape the rear wing plate 13 until the overall flatness of the stacker outer gantry column is ≤2mm.

[0079] After correction, as Figure 15 is shown. Example 2

[0080] The same scheme as in Example 1 is adopted, except that:

[0081] The welding process parameters in S2 are: current 300A, voltage 30V, and welding speed 500mm / min;

[0082] In S3, the first flame heating area 31 has a width of 40mm, the flame gun advances at a speed of 300mm / min; the second flame heating area 32 has a width of 40mm, the flame gun advances at a speed of 300mm / min; the third flame heating area 33 has a width of 60mm, the flame gun advances at a speed of 200mm / min, and the flame shaping temperature is 650℃.

[0083] In S5, when the deformation amount of the rear wing plate 13 is 2-10mm, the fifth flame heating area 51 has a bottom edge of 110mm and a height of 140mm, and the sixth flame heating area 52 has a bottom edge of 160mm and a height of 210mm, and the distance between the bottom edges of the fifth and sixth flame heating areas 51 and 52 is 100mm; when the deformation amount of the rear wing plate 13 is 10-20mm, the fifth flame heating area 51 has a bottom edge of 140mm and a height of 180mm, and the sixth flame heating area 52 has a bottom edge of 210mm and a height of 260mm, and the distance between the bottom edges of the fifth and sixth flame heating areas 51 and 52 is 100mm. Example 3

[0084] The same scheme as example 1 was used, except that:

[0085] S2 welding process parameters: current 280 A, voltage 28 V, welding speed 400 mm / min;

[0086] S3 first flame heating area 31 width 35 mm, flame gun travel speed 250 mm / min; second flame heating area 32 width 35 mm, flame gun travel speed 250 mm / min; third flame heating area 33 width 55 mm, flame gun travel speed 180 mm / min, the flame gun advances in a circle, the flame shaping temperature is 600℃;

[0087] S5 when the deformation of the rear wing plate 13 is 2-10 mm, the fifth flame heating area 51: bottom edge 100 mm, height 130 mm, the sixth flame heating area 52: bottom edge 150 mm, height 200 mm, the bottom edge distance between the fifth flame heating area 51 and the sixth flame heating area 52 is 80 mm; when the deformation of the rear wing plate 13 is 10-20 mm, the fifth flame heating area 51: bottom edge 130 mm, height 170 mm, the sixth flame heating area 52: bottom edge 200 mm, height 250 mm, the bottom edge distance between the fifth flame heating area 51 and the sixth flame heating area 52 is 80 mm.

Claims

1. A welding and shaping process for stacker external mast columns, characterized in that: The method comprises the following steps: S1, assembling the outer frame column of the stacker; The F-shaped section is formed by the web plate (11), the front wing plate (12) and the rear wing plate (13). The web plate (11) is placed on the assembly platform, and the front wing plate (12) and the rear wing plate (13) are assembled by taking the web plate (11) as a reference. S2, welding the outer frame column of the stacker; The first weld (21) is formed on the back of the web plate (11), and the second weld (22) is formed on the front of the web plate (11). The third weld (23) and the fourth weld (24) are formed on the front of the web plate (11). The first weld (21), the second weld (22), the third weld (23) and the fourth weld (24) are sequentially subjected to backing welding. After the backing welding is completed, the second weld (22) is sequentially subjected to filling welding, the first weld (21) is subjected to filling and surface welding, the third weld (23) and the fourth weld (24) are subjected to filling welding, and the second weld (22), the third weld (23) and the fourth weld (24) are subjected to surface welding. During welding of each weld, a welding sequence of symmetrical middle section or segmented back welding is adopted. After welding is completed and the workpiece is completely cooled, the reinforcing bars are removed. S3, correcting the width direction deformation of the web plate by one-time flame correction; The web plate (11) of the column is upward, the straightness in the width direction is measured, the deformation amount is determined, the first flame heating area (31), the second flame heating area (32) and the third flame heating area (33) are drawn on the web plate (11). The first flame heating area (31) is located on the upper side of the fourth weld (24), the second flame heating area (32) is located on the upper side of the first weld (21), and the third flame heating area (33) is located on the upper side of the fourth weld (24). The flame gun is opened to sequentially heat the three heating areas. After cooling, the flatness in the width direction is measured again. S4, correcting the length direction deformation of the web plate by two-time mechanical correction; The column is hoisted to the press platform, the deformation position of the web plate (11) is determined, the web plate (11) is downward and placed on the lower spacer plate (41), the upper spacer plate (42) is placed at the deformation position, the press head (43) is aligned with the upper spacer plate (42), and the pressure is applied to press and shape the deformation. S5, correcting the length direction deformation of the wing plate by two-time flame correction; The column is hoisted to the assembly platform, the straightness of the rear wing plate (13) is measured, the deformation starting position and the deformation amount are determined, the fifth flame heating area (51) and the sixth flame heating area (52) are drawn on the web plate (11), the sixth flame heating area (52) and the fifth flame heating area (51) are sequentially heated, the fifth flame heating area (51) is located at the deformation starting point, and the sixth flame heating area (52) is determined to be spaced from the fifth flame heating area (51). After heating and cooling, the straightness of the rear wing plate (13) is measured again. S6, correcting the local deformation of the column by two-time mechanical correction; The column is hung on the platform of the press, the local deformation position of the front wing plate (12) is determined, the first pad plate (61) and the second pad plate (62) are arranged below the web plate (11) and on both sides of the local deformation position and extend to below the third weld (23), the press head (43) is aligned with the local deformation position of the front wing plate (13), pressure is applied, and plastic deformation is fully performed, after the pressing is completed, the press head (43), the first pad plate (61) and the second pad plate (62) are removed, the straight ruler is placed on the front wing plate (13), the straight ruler is continuously moved, the deformation position is determined, and the shaping is performed again.

2. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein: In S1, the web plate (11) has a plate thickness of 25 mm, the front wing plate (12) has a plate thickness of 40 mm, the rear wing plate (13) has a plate thickness of 40 mm, and the material is Q345B; and the spacing between the reinforcing bars is 1 m.

3. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein, In S2, the welding process parameters are as follows: current 260-300 A, voltage 26-30 V, welding speed 300-500 mm / min, welding wire specification ER50-6, welding wire diameter φ1.2 mm, and protective gas 80% Ar+20% CO2.

4. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein: In S3, a linear heating mode is adopted, the first flame heating area (31) has a width of 30-40 mm, the flame gun has a traveling speed of 200-300 mm / min; the second flame heating area (32) has a width of 30-40 mm, the flame gun has a traveling speed of 200-300 mm / min; the third flame heating area (33) has a width of 50-60 mm, the flame gun has a traveling speed of 150-200 mm / min, the flame gun advances in a circle drawing mode, the flame shaping temperature is 500-650℃, and the flame gun uses oxygen-natural gas.

5. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein: In S4, the straight ruler is placed on the web plate (11), the straight ruler is continuously moved, the deformation position of the web plate (11) is determined, after the pressing is completed, the press head (43) and the upper pad plate (42) are removed, the straight ruler is placed on the web plate (11), the straight ruler is continuously moved, the deformation position is determined, the shaping is performed again, and the length direction straightness of the web plate (11) of the outer gantry column of the stacker meets the requirements.

6. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein: In S5, the straightness of the rear wing plate (13) is measured by means of a pull line.

7. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 1, wherein: In S5, the second flame adopts an isosceles triangle area heating mode, the bottom end point of the fifth flame heating area (51) is located at the deformation starting point, and the bottom of the sixth flame heating area (52) is spaced from the bottom of the fifth flame heating area (51).

8. The welding and contouring process for the outside gantry column of a reach stacker according to claim 7, characterized in that: The size of the flame heating area in S5 is determined by the deformation amount of the rear wing plate (13). When the deformation amount of the rear wing plate (13) is 2-10 mm, the fifth flame heating area (51) has a bottom edge of 90-110 mm and a height of 120-140 mm, the sixth flame heating area (52) has a bottom edge of 140-160 mm and a height of 190-210 mm, and the distance between the bottom edges of the fifth flame heating area (51) and the sixth flame heating area (52) is 50-100 mm; when the deformation amount of the rear wing plate (13) is 10-20 mm, the fifth flame heating area (51) has a bottom edge of 120-140 mm and a height of 160-180 mm, the sixth flame heating area (52) has a bottom edge of 190-210 mm and a height of 240-260 mm, and the distance between the bottom edges of the fifth flame heating area (51) and the sixth flame heating area (52) is 50-100 mm.

9. The welding and contouring process for the outside gantry column of a reach stacker as claimed in claim 7, wherein: In S5, the flame heating path is heating from the outer periphery of the triangle to the center or heating from the bottom edge of the triangle to the top point back and forth, and the flame gun advances in a circle to ensure uniform heating, and the flame shaping temperature is 500-650 DEG C.

10. The welding and contouring process for the outside gantry column of a reach stacker according to claim 1, characterized in that: In S6, the third pad plate (63) is placed below the local deformation position, the fourth pad plate (64) is placed at the deformation position of the front wing plate (13), and pressure is applied for shaping. The rear wing plate (13) is repeatedly pressed and shaped in the same way until the overall flatness of the outer portal column of the stacker is ≤2 mm.

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