DE2102132A1 - Heating oil tank bottom welding machine - with welding head aligning mechanism - Google Patents

Abstract

The equipment incorporates means which align the weld seam area between bottom and side wall so that the electrode is directed properly into the gap, which has to be welded to obtain a stable weld zone with adequate depth and correct weld penetration. In the prefd. method alignment is effected by a roller running along the edge of the wall and another roller runner over its circumference, the workpiece being moved past the stationary welding head. The equipment is intended for the mfr. of light metal thin walled heating oil tanks and permits their mass prodn.

Description

"Device and method for welding container bottoms".

The invention relates to a device for automatic seam welding of container bottoms including the arrangement of the weld seam, especially for thin-walled light metal containers for storing heating oil.

With such containers it is important that a reliable tightness and strength of the weld seams with uniform penetration is guaranteed to Avoid reworking and subsequent mantle cracks. It is especially with light metal difficult to keep the depth of penetration constant and hurry to avoid burn-through.

It is known to have bottoms of metal containers with automatic seam welding devices to weld.

In the known devices, however, there is the disadvantage that the Melting direction is arranged in about 900 to the material thickness. Thin-walled light metal walls are very easily burned through with this method of working, or with insufficient penetration not professional clit welded t.

The invention is based on the object, despite the small wall thicknesses to ensure a favorable penetration depth and at the same time an atis flow of the Prevent melt.

This object is achieved according to the invention in that a device is provided that the penetration and the melting of the welding process in the Overlap gap of inner sheet metal under floor aligns so that in welding direction a stable zone with depth reserve is achieved.

An embodiment of the invention is shown in the drawing and is described in more detail below: FIG. 1 shows the welding device with arrangement of the weld seam in section, FIG. 2 shows the side view of the welding device with clamped workpiece, Fit. 3 the top view of the welding device.

An electrode holder 1 with automatic wire feed and inert gas supply is set up by an articulated arm 2 so that the melting of the electrode 5 is guided approximately in the direction of the overlap gap 4, which is caused by the overlap of the container jacket 5 consists of the container bottom £. The penetration of the weld seam 7 is preferably provided in the frontal direction of the overlap so that it burns through is avoided and there is a stable zone under the firing as a material reserve is 1 which also acts as a cheap heat sink.

a stepless setting up of the articulated arm 2 is possible by means of a ball joint i; or swivel joints are provided which can be locked in any position are.

For precise guidance - depending on the workpiece, there are guide rollers 9 and 10, which are separated from each other in direction A = parallel to the weld seam 7 unroll under spring tension and trace the electrode holder in height and / etc. Determine the side.

The height of the electrode holder 1 to the weld seam 7 is determined by the Transfer guide roller 9 at the edge of the jacket plate 5. The flat profile is chosen so that stitching points and the finished seam can be assessed without leaving the track influence. The sliding roller 10 follows the track of the jacket sheet 5 under spring tension of the swing arm 11 including the articulated arm 2 and transfers directly to the trace of the electrode holder 1.

By the spring preload of the swing arm 11 is a Pressure of the jacket plate 5 causes at the level of the weld.

For better dissipation of the welding heat and avoidance of distortion a form-fitting cooling pipe clamp 12 is optionally provided, which of a Cooling medium 15 is flowed through via hose lines 14, and by means of a quick-release fastener 15 incl.

Gel enk 16 in the edge zone of the weld 7, the cladding sheet 5 below Bias encloses.

To prevent the melt from flowing out in the vicinity of the welding point, a support spring 17 is optionally provided, which is pretensioned on the jacket plate 5 grinds and by its own curvature is able to provide a form-fitting edge covering to effect.

The support spring 17 is preferably made of spring steel sheet and is attached to the Schkingarm 11.

As can be seen from the overview drawings Fig.2 and Fig. 3, is a support arm 18 is provided, which is pivotably centered on a chassis 19 on one side and all of the opposite side is supported by an adjustable runner 20.

The electrode guide is in a tangential position to the workpiece circumference Mounted on the support arm 18 under spring tension via the swing arm 11 and pivot bearing 21 A controllable gear motor 22 sets a ring gear 24 over the output edge 23 Feed movement that is matched to a track corresponding to the weld seam. Vacuum suction feet 25 cause an easily detachable, non-positive fit on the container bottom 6 Connection of the feed device to the workpiece.

A support plate 2 <; connects a guide rail via spacer feet 27 28, on which the landing gear 19 29 straight movements via guide rollers between end stops as soon as the circular movement of the feed mode ends and an Elitnellmer pawl 30 engages in the locking latch 31.

The disengagement of the driver pawl 30 takes place at the end of the straight line Movement through run-up pieces 32 around the limited by additional end stops to convert straight travel path steplessly into a circular movement.

The feed operation described above guides the workpiece in the predetermined trace of the weld seam 7 under the welded parts of the electrode holder 1 along.

A fork carriage 33 picks up the workpiece in a frame 34, which is kept under tension by a quick release fastener 35.

The castors 36 are provided for an unconstrained sequence of movements to be realized on a flat floor surface 37.

To turn the clamped workpiece after the welding process has been completed, a bearing 38 is provided, on the axis of which by means of a handwheel 39 180 swings are executed.

A latch keeps the working position constant.

A suspension eyelet 40 is provided on the support arm 18, which is used for each work sequence is useful for lifting the device.

A guide column 41 allows the working position to be adjusted in height and a pivoting in the rest position.

The welding rectifier 42 with automatic wire feed and protective gas device is connected via lead 43.

The advantages achieved by the invention are that when Welding of thin-walled tank bottoms (preferably for light metal) an automatic Welding is made possible with deep penetration and reliable tightness manufacturing risks significantly reduced.

Thanks to simple, lightweight feed devices, it requires little means an automatic process is implemented after brief instruction by semi-skilled workers People can be operated and monitored.

Choosing an advantageous welding direction provides a stable zone with depth reserve to avoid the welding point from burning through.

Claims (17)

Claims. Apparatus and method for welding container bottoms including the arrangement of the weld seam, especially for thin-walled light metal containers for the storage of heating oil, characterized in that a device is provided 9 is the penetration and the melting of the welding process into the overlap gap of the jacket plate and the bottom aligns, so that a stable zone with in the welding direction Depth reserve is achieved. 2. Device and method for welding container bottoms according to Claim is characterized in that an electrode holder (1) with automatic Wire feed and inert gas supply through an articulated arm (2) is set up in such a way that that the welding direction of the electrode (3) is approximately aligned in the direction of the overlap gap (4) is performed. 3. Device and method for welding container bottoms according to Claims 1 and 2, characterized in that a guide roller (9) is provided, which transmits the height of the electrode holder depending on the jacket plate (5) and by location, including profiling, tack points and finished welds run over unaffected. 4. Device and method g for welding container bottoms according to Claims 1 - 3, characterized in that a guide roller (io) the jacket plate (5) on the circumference under bias of a swing arm (it) moves and the track over the Articulated arm (2) transfers to the electrode holder (i) parallel to the weld seam (7). 5. Apparatus and method for welding container bottoms according to Claim 1- 41 characterized in that an easily removable cooling pipe clamp (12) is provided, which in the edge zone of the weld seam (7) the cladding sheet (5) encloses positively under tension. 6. Apparatus and method for welding container bottoms according to Claim 1 - 5, characterized in that a support arm (18) is provided which is centered pivotably on one side on a chassis (19) and on the opposite side supported by an adjustable runner (20) including guide column (41) will. 7. Device and method for welding container bottoms according to Claim 1 - 6, characterized in that in the tangential direction to the workpiece circumference a swing arm (il) is provided, which is attached to the support arm (iu) in a pivot bearing (21) is under adjustable spring preload. 8. Apparatus and method for welding container bottoms according to Claims 1 - 7, characterized in that on the support arm (a controllable gear motor is attached, which via output wheel (23) a ring gear (24) in feed motion sets, which is matched to the track of the weld seam (7). 9. Apparatus and method for welding container bottoms according to Claims 1 - 8, characterized in that a support spring (17) made of spring steel sheet is provided, which under bias and its own curvature a form-fitting edge cover the welding point caused by grinding movement. 10. Apparatus and method for welding container bottoms according to Claim 1 - 9, characterized in that a support plate (26) including Toothed ring (24) by means of vacuum suction feet (25) frictionally with the container base (6) is easily detachably connected. 11. Apparatus and method for welding container bottoms according to Claims 1-10, characterized in that a guide rail (28) is provided by spacer feet (27) is connected to the support plate (26) so that straight over rollers (29) Movements of the chassis (19) are driven between end stops as soon as the Circular movement of the feed operation is completed and a driver pawl (30) in the latch (31) engages. 12. Device and method for welding tank bottoms according to Claims 1 - 11, characterized in that run-up pieces (32) are provided, which cause the driver pawl (v0) to disengage and thereby speed continuously Enable transition to the next circular movement. 13. Apparatus and method for welding container bottoms according to Claim 1 - 12, characterized in that the workpiece is in the predetermined track along the weld seam (7) under the weld of the electrode holder (i) will. 14. Device mid method for welding container bottoms according to Claims 1 - 13, characterized in that a fork carriage (33) is provided which holds the workpiece in a clamping frame (34) and in a quick-release fastener (35) carries under tension. 15. Device and method for welding container bottoms according to Claim 1-14, characterized in that under the fork carriage (33) castors (36) are provided, which allow an unconstrained sequence of movements on a flat base plate (37) allow. 16. Apparatus and method for welding container bottoms according to Claim 1-15, characterized in that the fork carriage (33) has a bearing (38) is provided, on the axis of which the workpiece can be pivoted through 180 ° and is in the working position clicks into place. 17. -Device and method for welding container bottoms according to Claim i - 16, characterized in that a guide column (41) is provided, a change in the working height via an adjustable runner (20) - in assignment the workpiece size - provides.