CN1141199C - Tungsten polar helium arc welding method for butt joint of profile aluminium alloy material - Google Patents

Abstract

The present invention relates to a tungsten polar helium arc welding method for the butt joint of deformed aluminium alloy sectional bars, which is characterized in that sectional bars to be butt-jointed are clamped by a heat radiating copper clamp and are filled in a prefilling welding piece; then a tungsten polar helium arc welding method with no wire feeding is adopted; a welding power supply works in a DC positive mode; mother materials of the sectional bars are welded which cutting by adopting short arc welding; the adopted soldering piece is aluminium-silicon hypoeutectic alloy; a multi-stage welding mode is adopted for butt surfaces with complex shapes. The method of the present invention has stable and reliable welding quality, high production efficiency and low production cost, and is applicable for the butt welding of aluminium alloy car door sectional bars and sectional bars of other application.

Description

A kind of profile aluminium alloy material butt joint tungsten polar helium arc welding method

Technical field

The present invention relates to be specially adapted for particular product arc welding technology, the technology of the car door spare that specifically a kind of special welding is made of aluminum alloy extrusion section bar is more specifically said so and is docked welding method between the aluminium alloy extrusions.

Background technology

During Modern Car was produced, the ratio that aluminum alloy materials is used was increasing, and wherein car Men Zeyin adopts the aluminum alloy junction member to have many good qualities and used widely.For the car door that uses aluminium alloy extrusions, the section bar that has will dock welding by certain angle, for guaranteeing after its welding enough mechanical strengths (tension and yield strength) and appearance characteristics are arranged, be to adopt butt welded seam to beat groove in the past, weld with argon arc welding method, but the method is beaten groove and is difficult to implement for the section bar of butt joint end face complexity, makes it production efficiency and reduces greatly.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art, propose butt-welded method between the section bar of a kind of low cost of manufacture, steady quality is reliable, production efficiency is high aluminium alloy sedan door section bar or other purposes.

Profile aluminium alloy material butt joint tungsten polar helium arc welding method of the present invention may further comprise the steps:

(1) section bar that will dock after the cleaning clamps with copper cooling clamper, and inserts pre-filling weld tabs at its seam crossing, and described section bar wall thickness is the profile shapes of 1-5 millimeter, and described weld tabs material is aluminium-silicon hypoeutectic alloy, and its thickness is the 1.5-2.5 millimeter;

(2) butted section bars to step (1) adopts no wire feed tungsten polar helium arc method, be that the source of welding current is worked in the straight polarity mode: workpiece is a positive pole, welding gun is a negative pole, in the tungsten electrode welding machine device robot system of standard, automatic wire feeding mechanism is installed on the welding gun side, in welding, fill scolder automatically, because sealing weld sheet in advance in step (1), so cancel the automatic feeding machine; The section bar mother metal is promptly cut i.e. weldering, cut and welded in back 5 minutes; The tungsten electrode welding gun becomes 50-120 degree angle in the welding gun direction of advance with welding curve tangent line along the weld tabs plane, along with weld tabs constantly melts, the welding of formation short arc, after the weld tabs fusing, tungsten electrode is the 0.8-1.0 millimeter to the distance between the weld seam, tungsten polar helium arc connects employed helium purity 〉=99.9%, helium gas flow 3-4 liter/centimetre ²Minute, wherein square centimeter is meant the torch head hole area, electric current and welding gun point speed adopt big electric current to add at a high speed, in the short as far as possible time, energy is imported weld seam, to reach the effect that fusion penetration is big, weld seam is narrow, described electric current 10-150 ampere, welding gun point speed is the 0-70 cm per minute, speed is 0 to be meant that welding gun is in the fusing delaying state of arcing point when the starting the arc;

(3) interface to complicated shape adopts the welding of 2-3 section, and arcing point is selected in the place of wall thickness maximum.

The described copper cooling clamper of step (1) is wanted as close as possible weld seam, so that the face of weld maximum of joint, the heat affecting that mother metal is subjected to reduces as far as possible, to improve weld strength and to keep best welding point geometry.

The described welding gun of step (2) can adopt the welding gun path repeatability to be ± 0.1 millimeter general 6 welding robots or the fixation locus welder welded seam of equal accuracy, the present invention selects 6 robots of VOI type of Japanese OTC company for use, and the AVP-300 type tig arc welding machine of coupling the said firm.

Section bar that the present invention is used and weld tabs will carry out oil removing, and the trade mark that adopts Shanghai Henkel Corp. to produce is that 1402 cleaning agents cleaned 5 minutes, cleans with 50-60 ℃ of clear water; The trade mark of producing with Henkel Corp. is the oxide-film that 144 surface conditioning agents are removed weldment and weld tabs again, and 5 minutes time, fluid temperature 50-60 ℃, clear water is cleaned, dried then.

Major advantage of the present invention:

The section that the present invention relates to the al-mg-si alloy section bar that mechanical performance is good welds together, for welding area and cracking resistance line ability and the weld strength of taking into account solder side, the present invention adopts aluminium-silicon hypoeutectic alloy weld tabs, if adopt aluminium-silicon eutectic alloy weld tabs, the mechanical strength of weld seam is difficult to guarantee; The present invention adopts mother metal promptly to cut and promptly welds mode, has overcome the disadvantage that is produced weld defect by pellumina, particularly adopts the straight polarity heliarc welding, and protect that weld seam promptly cuts is that soldering method is more necessary; In various arc-welding, heliarc positive polarity welding is best a kind of of concentration of energy, add the hidden arc welding method of forcing down electric arc and cooperate high-power heat radiation and the big high-speed measure of electric current, the welding quality and the outward appearance of commissure all are improved, weld seam mother metal cutting end face and weld tabs are all fused, but the mother metal surface keep the outward appearance of obviously not subsiding and being out of shape again; The present invention also adopts arc welding robot to weld, its advantage is: at first be the precision height of track, it is convenient to revise track, moreover the cooperation between the welding gun speed, electric current, voltage, all parameter of input energy, also very convenient, the optimization of welding quality becomes easier.

Further specify characteristics of the present invention below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is a welding procedure apparatus structure schematic diagram;

Fig. 2 is the clamp structure schematic diagram;

Fig. 3 is an assembly relation schematic diagram between weld tabs and the mother metal;

Fig. 4 is Fig. 3 A-A cutaway view and two sections welding schematic diagrames;

Fig. 5 is three sections welding schematic diagrames.

The specific embodiment

Comprise welding robot 1 (producing), the parallel saw 2 of double end among Fig. 1, send weld tabs device 3 by Japanese OTC company, mobile platform 4, anchor clamps large platform 5, anchor clamps 6, fixed platform 7, the parts 8 that welded, parts 9 to be welded.Wherein anchor clamps 6 are installed on the clamping fixture seat 11, mobile platform 4 can move back and forth at anchor clamps large platform 5 upper edge tracks 10, anchor clamps large platform 5 is symmetrical structures, the left and right car door parts 8,9 of difference clamping symmetry, the anchor clamps large platform 5 that is loaded with mobile platform 4 can move back and forth on fixed platform 7 along track 12.

By shown in Figure 1, in the A workspace, the horizontal mobile platform 4 of mother metal anchor clamps is in opening, opens anchor clamps (copper heat radiation) 6, the part 9 that cleaning treatment is the good anchor clamps of packing into, anchor clamps 6 clamp, the parallel saw 2 of double end is along arrow a direction is to the part sawing among the figure, and dual-end saw is return original position, send weld tabs device 3 that weld tabs is sent into the abutment joint place, platform 4 moves along arrow b direction weld tabs is clamped, and film advance mechanism 3 resets; And the welding operation of the opposite side parts that installing in the C workspace, by welding robot 1 segmentation parts 8 (parts 8 are opposite side car door parts of filling in a last circulation) are implemented welding, after welding and above-mentioned piece installing prepare all to finish, anchor clamps large platform 5 moves on fixed platform 7 along arrow C, off-the-shelf parts are moved into C station district carry out welding operation, the parts 8 that weld are in the B workspace, anchor clamps 6 are opened, take out parts 8, repeat the operating procedure in A station district then, the part of this side anchor clamps of packing into are to be welded, enter next circulation again, the dual-end saw 2 described in the figure, anchor clamps 6, send the weld tabs device to belong to fexible unit.

By shown in Figure 2,6-1 is the weld seam that utilizes this method to weld, 6-2 is the mother metal parts, 6-3 is with this method weld seam to be welded, 6-4 is the bottom of copper cooling clamper, 6-6 is the top of copper cooling clamper, and it is rotated counterclockwise along the figure axis and closes at anchor clamps 6-4 upward to parts enforcement clamping, and 6-5 is the car door trigonum part with the additive method welding.

By shown in Figure 3, weld tabs is inserted between the mother metal of two butt joints.

By shown in Figure 4, for the joint unit 9 employing 2-3 section welding of complicated shape mother metal, Fig. 4 shows two sections docking modes, carries out the 1st section welding clockwise by arcing point, and then carries out the 2nd section welding from the arcing point counterclockwise.

By shown in Figure 5, joint unit 9 adopts three sections welding.9-1～9-18 is the continuous setting number between each section among the figure.Welding process: 9-1～9-4 is first section welding, and 9-5～9-14 is second section welding, and 9-15～9-18 is the 3rd section welding.The parameter of three sections welding sees Table 1.

Table 1 welding parameter

Segmentation		Send on the gas shiled time (second)	Time delay after the starting the arc (second)	Welding gun point movement velocity (centimeters/minute)	Electric current (ampere)	Receive arc and postpone the getter time (second)
							First section	9-1	0.5	1.0	40	130
9-2			40	130
						9-3				45	133
9-4				40	1.0
						Second section		9-5	0.5	1.2	39	121
9-6			41	100
							9-7			50	105
9-8			25	110
							9-9			35	120
9-10			40	45
							9-11			50	30
9-12			20	18
							9-13			50	45
9-14				17	1.0
							The 3rd section	9-15	0.5	1.2	20	120
9-16			50	130
						9-17				45	85
9-18		0.2		10	1.0

Claims (1)

1. a profile aluminium alloy material butt joint tungsten polar helium arc welding method is characterized in that welding process comprises the steps:

(1) section bar that will dock after the cleaning clamps with copper cooling clamper, and inserts pre-filling weld tabs at its seam crossing, and described section bar wall thickness is the 1-5 millimeter, described weld tabs material is aluminium-silicon hypoeutectic alloy, its thickness is the 1.5-2.5 millimeter, and described copper cooling clamper will be near weld seam

(2) butted section bars to step (1) adopts no wire feed tungsten polar helium arc method, and promptly the source of welding current is worked in the straight polarity mode; Workpiece is anodal, and welding gun is a negative pole, and the section bar mother metal is promptly cut i.e. weldering; The tungsten electrode welding gun becomes 50-120 degree angle in the welding gun direction of advance with welding curve tangent line along the weld tabs plane, and with the short arc welding, after the weld tabs fusing, tungsten electrode is the 0.8-1.0 millimeter to the distance between the weld seam, described helium purity 〉=99.9%,

Helium gas flow 3-4 liter/centimetre ²Minute, the used electric current of welding gun is the 10-150 ampere, welding gun point speed is the 0-70 cm per minute,

(3) interface to complicated shape adopts the welding of 2-3 section, and arcing point is selected in the place of wall thickness maximum.

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