CN105345223A

CN105345223A - Automatic welding repair method for anode steel claw head

Info

Publication number: CN105345223A
Application number: CN201510867586.6A
Authority: CN
Inventors: 王星星; 王博; 李智勇; 杜全斌; 杨杰; 孙国元; 赵石忠; 冯晓强
Original assignee: North China University of Water Resources and Electric Power
Current assignee: North China University of Water Resources and Electric Power
Priority date: 2015-12-02
Filing date: 2015-12-02
Publication date: 2016-02-24
Anticipated expiration: 2035-12-02
Also published as: CN105345223B

Abstract

The invention discloses an automatic welding repair method for an anode steel claw head. The automatic welding repair method comprises the steps of cutting the corrosion loss section of the steel claw head and trimming the cutting surface to a plane; selecting a round steel rod with the same material and diameter as the anode steel claw head and turning the end surface to a plane; selecting an auxiliary connection rod with the same or similar material as the anode steel claw head, welding the auxiliary connection rod between the cutting surface of the steel claw head and the end surface of the round steel rod coaxially and annularly and forming annular build-up welding space between the steel claw head and the round steel rod; welding the whole annular build-up welding space solidly through an automatic annular horizontal welding method and then completing welding repair of one anode steel claw head. According to the automatic welding repair method, the annular build-up welding space is formed between the cutting surface of the steel claw head and the end surface of the round steel rod through the auxiliary connection rod and is welded solidly through the automatic annular horizontal welding method, and therefore automatic welding repair of the anode steel claw head is realized, the labor intensity is lowered, the repair efficiency is improved, the qualification rate of welded joints is high, the electrical resistivity is low, the power consumption is small, the strength is high, and the production cost is lowered for enterprises.

Description

A kind of automatic welding restorative procedure for anode steel claw head

Technical field

The present invention relates to heavy in section metal material automatic welding recovery technique, especially relate to a kind of automatic welding restorative procedure for anode steel claw head.

Background technology

Anode steel claw is that Aluminum Electrolysis Production process uses more equipment part, because it contacts with electrolytic aluminium liquid for a long time, is very easily corroded in high temperature, big current operating environment, thus causes consumption large, and task of repairing is comparatively heavy.For a long time, the reparation of domestic aluminium electrolysis enterprise antianode steel pawl all adopts manual arc soldering method, i.e. traditional weld all around method, but because of the limitation of weldment retaining wall on slope and welding procedure, this welding method not only efficiency is low, and welding point to there is bonding area little, strength of joint is low, resistivity is large, and the shortcomings such as service life is short, therefore have a strong impact on and restrict the control of aluminium electrolysis enterprise to production cost.

For many defects of traditional weld all around method that the reparation of anode steel claw head uses, some mechanisms have developed casting technology in recent years, and came into operation.The principle of casting technology is that steel pawl after dicing arranges a crystallizer, place one section of round steel bar in crystallizer, adopt founding soldering equipment, rod iron is melted, utilize together with the molten steel melted to cast with the steel pawl first melt of damage by crystallizer, until reach the height needed for steel pawl head.The method to some extent solves the larger problem of weld all around connection resistance rate, but welding equipment floor space is large, and disposable input is comparatively large, also there is certain potential safety hazard.

In view of the limitation of above two kinds of methods, there is mechanism to adopt the method for auxiliary brace built-up welding recently, between cylindrical steel rods and steel pawl head section, namely forms two reciprocity semicircular body built-up welding supplement space, then respectively two built-up welding are supplemented space built-up welding weldering reality.This welding repair method is compared with casting technology with weld all around method, and welding point resistivity is able to very big reduction, but the method due to automaticity low, welding efficiency is lower, and simultaneously the residual stress of welding point is comparatively large, and weldment axiality is poor, yielding.

Summary of the invention

The object of the present invention is to provide a kind of automatic welding restorative procedure for anode steel claw head, the method achieved the automatic welding reparation at steel pawl head scaling loss position, greatly reduce labour intensity, improve remediation efficiency.。

For achieving the above object, the present invention can take following technical proposals:

Automatic welding restorative procedure for anode steel claw head of the present invention is:

The first step, first the scaling loss section of anode steel claw head to be repaired excised completely, cut surface accomplishes plane; According to the design size of steel pawl head, choose one section of round steel bar identical with diameter with this anode steel claw head material, facing becomes plane;

Second step, choose identical or close with anode steel claw head material to be repaired, length 15 ~ 35mm, diameter 4 ~ 10mm auxiliary pitman, and by its boxing between the cut surface and round steel bar end face of anode steel claw head, ensure that anode steel claw head, auxiliary pitman and round steel bar are coaxial, between anode steel claw head and round steel bar, form annular built-up welding space;

3rd step, adopts automatic annular horizontal position welding method by real for whole annular built-up welding space weldering, namely completes the REPAIR WELDING of an anode steel claw head.

Described automatic annular horizontal position welding method is that narrow gap monofilament or mariages swinging arc weld or gas metal-arc welding, and welding wire used is flux-cored wire or solid core welding wire.

During diameter >=the 6mm of described auxiliary pitman, its two ends are circular cone structure, its tapering is 80 ~ 110 °, end round platform diameter is 1 ~ 3mm, after its boxing is between the cut surface and round steel bar end face of anode steel claw head, form the two single bevel groove of band root face, its bevel angle 35 ~ 50 ° of C, root face length is 1 ~ 3mm.

The invention has the advantages that and solve traditional weld all around method, the drawback existing for restorative procedure such as casting technology and auxiliary brace welding method, utilize the annular built-up welding space that auxiliary pitman is formed between steel pawl head cut surface and round steel bar end face, adopt automatic annular horizontal position welding method by real for the weldering of annular built-up welding space, achieve the automatic welding reparation of anode steel claw head, greatly reduce labour intensity, improve repair efficiency, and the qualification rate of welding point high (>=95%), resistivity is low, power consumption is little, intensity is high, extend the service life of anode steel claw head, reduce enterprise's production cost.

Accompanying drawing explanation

Fig. 1 is that the present invention welds schematic diagram.

Fig. 2 is the amplification assumption diagram of auxiliary pitman in Fig. 1.

Detailed description of the invention

Below by doing more detailed description to the inventive method by reference to the accompanying drawings.

As shown in Figure 1, the automatic welding restorative procedure for anode steel claw head of the present invention is:

The first step, first adopts gas cutting the scaling loss section of anode steel claw head 1 to be repaired to be excised completely, and cut surface is accomplished plane; According to the design size of steel pawl head, choose one section of round steel bar 2 identical with diameter with this anode steel claw head material, facing becomes plane;

Second step, choose identical or close with anode steel claw head 1 material to be repaired, length 15 ~ 35mm, diameter 4 ~ 10mm auxiliary pitman 3, and by its boxing between the cut surface and round steel bar 2 end face of anode steel claw head 1, ensure that anode steel claw head 1, auxiliary pitman 3 and round steel bar 2 are coaxial, between anode steel claw head 1 and round steel bar 2, form annular built-up welding space 4;

If when assisting the diameter < 6mm of pitman 3, auxiliary pitman 3 is cylinder; As the diameter >=6mm of auxiliary pitman 3, its two ends are circular cone structure, tapering is 80 ~ 110 °, end round platform diameter is 1 ~ 3mm, as shown in Figure 2, after its boxing is between the cut surface and round steel bar 2 end face of anode steel claw head 1, annular built-up welding space 4 forms the two single bevel groove of band root face, its bevel angle 35 ~ 50 ° of C, root face length is 1 ~ 3mm;

3rd step, adopts narrow gap monofilament or the weldering of mariages swinging arc or gas metal-arc welding (welding wire 5 adopts flux-cored wire or solid core welding wire) by real for whole annular built-up welding space weldering, namely completes the REPAIR WELDING of an anode steel claw head; In welding process, adopt weldment (anode steel claw head 1, auxiliary pitman 3 and round steel bar 2) fixing, the method that welding gun 6 is walked about around circular or semicircle is welded.

Such as, the anode steel claw A of the single four paws head of certain electrolytic aluminium factory domestic needs REPAIR WELDING, and steel pawl head material is ZG230-450, and intended diameter is φ 180mm, and design length is 280mm.First excised by steel pawl head 1 scaling loss section gas cutting, residue segment length is 110mm; Select diameter to be the thick round steel bar of Q235 2 and the diameter of φ 180mm to be that the Q235 of φ 8mm is auxiliary is connected (thin round steel) excellent 3, length is respectively 145mm and 25mm, to the two ends of connection (thin round steel) rod 3 be assisted to be processed into circular cone structure, tapering be 90 °, and end round platform diameter is 2mm; Before the excellent 3 boxing solid weldings of auxiliary connection (thin round steel), to steel pawl head 1 cut surface and thick round steel bar 2 welding end surface polishing light, expose metallic luster, then, place it on positioning fixture, the 3 coaxial boxing solid weldings of connection (thin round steel) rod will be assisted at steel pawl head 1 cut surface and thick round steel bar 2 welding end surface center, and the bevel angle that two ends, annular built-up welding space 4 are formed is 45 ° of C; Adopt the monofilament weldering of narrow gap to carry out automatic ring horizontal position welding to whole annular built-up welding space 4, and by real for whole annular built-up welding space weldering, complete the REPAIR WELDING of a steel pawl head, in welding process, weldment is fixed, and welding gun 6 circle is walked about, and welding gun 6 termination swinging arc, welding wire 5 is flux-cored wire.

Carry out failure test detection to the anode steel claw head after repairing, result shows that joint all realizes metallurgical binding, flawless, is mingled with and the defect such as incomplete fusion; Its pressure fall-off test result is 55 millivolts, substantially close to anode steel claw average pressure drop 50 millivolts, meets its instructions for use.

Claims

1., for an automatic welding restorative procedure for anode steel claw head, it is characterized in that:

2. the automatic welding restorative procedure for anode steel claw head according to claim 1, is characterized in that: described automatic annular horizontal position welding method is that narrow gap monofilament or mariages swinging arc weld or gas metal-arc welding, and welding wire used is flux-cored wire or solid core welding wire.

3. the automatic welding restorative procedure for anode steel claw head according to claim 1, is characterized in that: during the diameter >=6mm of described auxiliary pitman, its two ends are circular cone structure, and its tapering is 80 ~ 110 °, and end round platform diameter is 1 ~ 3mm.