CN102806423A - Welding wire filling laser welding method utilizing non-oriented silicon steel - Google Patents

Abstract

A welding wire filling laser welding method utilizing non-oriented silicon steel includes steps of (1), taking plain carton steel with the silicon content smaller than 1.0% or low-grade non-oriented silicon steel as a leading tape for laser splice welding, taking non-oriented silicon steel with the silicon content ranging from 1.0%-3.5% as a base material for laser splice welding, cutting the tail of the leading tape and the head of the base material and the splicing the two together; (2), performing laser welding by a laser welder with the laser power of 5.0-9.0KW, the welding speed of 2.0-5.8meter/minute and the welding wire filling speed of 3.0-5.8meter/minute; and (3), selecting the plain carton steel with the silicon content smaller than 1.0% or low-grade non-oriented silicon steel as a leading tape after finishing welding, and then repeating the above steps to realize continuous productions. The welding wire comprises, by weight, C</=0.10%, Si</=0.85%, Mn</=0.98%, P</=0.015%, S</=0.015%, Cr</=0.013%, Al</=0.010% and the balance being Fe; and helium gas is selected as a protective gas for protecting and cooling welded joints during laser welding.

Description

A kind of non-orientation silicon steel laser welding with filler wire method

Technical field

The present invention relates to laser welding technology, relate in particular to a kind of laser welding with filler wire method of non-orientation silicon steel.

Background technology

In cold rolling continuous production processes, the end of the more very important hot-strip that will move ahead exactly and the head of follow-up band steel weld the formation weld seam, make it pass through rolling line then, form continuous rolling, can enhance productivity greatly.At this moment, if weldquality is bad, then weld seam broken belt can occur through roll line the time, causes producing interrupting.Therefore laser welding technology is suitable for the especially welding of steel band sheet material of many fields because of Laser Welding Quality is high, contactless, depth-to-width ratio big, distortion is little, welding is attractive in appearance and the mechanical performance of weld seam is basic consistent with mother metal.But for silicon steel product, because silicon content is compared straight carbon steel and wanted high many in the material, the plasticity and the toughness of material are relatively poor; This material is carried out laser weld, and weld seam fragility is big, and produces bigger weld stress; Cause the mechanical performance of weld seam to compare a certain distance with mother metal; Particularly flexural strength significantly descends, and this just is difficult to satisfy the field that the butt welded seam mechanical performance has higher requirements, like the cold rolling unit of continuity.At present,, can adopt the technology of laser weld and after annealing, eliminate weld stress, improve the logical plate performance of weld seam the ordinary carbon steel product.And when silicon steel was produced, like the non-orientation silicon steel product of silicon content 1.0%～3.5%, traditional welding procedure can't satisfy its quantity-produced requirement, can only adopt the production of reversable mill monovolume, and its production efficiency will reduce greatly.

The bending resistance of the continuous production butt welded seam of non-orientation silicon steel product has high requirement; Existing solder technology can't guarantee the weldquality of silicon content at 1.0% above non-orientation silicon steel; Through milling train the time under the effect of heavy reduction, hightension, the weld seam broken belt takes place very easily.

Korean Patent KR2007066250.A discloses and has a kind ofly realized Laser welding of silicon sheet method, 1 through weld preheating and post-weld annealed) butt welded seam carries out The pre-heat treatment before the laser weld, heating and temperature control is at 400 ℃-750 ℃, heat time heating time 5s-60s; 2) welding procedure is welded by 4mpm-12mpm by laser power 6.5KW-8.5IKW, speed of welding; 3) butt welded seam carries out post-weld annealed and handles after the laser weld, and heating and temperature control is at 700 ℃-1050 ℃, heat time heating time 5s-60s.This method weld preheating and post-weld annealed need increase the weld seam heater newly on the one hand, have increased equipment investment and maintenance cost; Weld preheating and post-weld annealed are equivalent to increase technological process on the other hand, have prolonged weld interval, and be bigger to the influence of continuous type unit production capacity.

Summary of the invention

The object of the present invention is to provide a kind of non-orientation silicon steel laser welding with filler wire method, realize the welding of silicon content in the 1.0%-3.5% scope, and its weld seam can satisfy the requirement of milling train quantity-produced.

For achieving the above object, technical scheme of the present invention is:

A kind of non-orientation silicon steel laser welding with filler wire method, it comprises the steps:

1) with silicon content at the straight carbon steel below 1.0% or low grade non-oriented silicon steel leader tape as laser splicing weldering, at 1.0%～3.5% the non-orientation silicon steel mother metal as laser splicing weldering, above silicon content is all by weight percentage with silicon content; The centering splicing after shearing of taking the lead with the magnetic tape trailer of leader tape and mother metal; Said splicing gap is 0.10mm～0.30mm;

2) laser weld, the laser power of laser welder are 5.0～9.0KW, and speed of welding is 2.0 meters/minute～5.8 meters/minute, and the filling speed of welding wire is 3.0 meters/minute～5.8 meters/minute; The component of weld wire percentage by weight is: C≤0.10%, and Si≤0.85%, Mn≤0.98%, P≤0.015%, S≤0.015%, Cr≤0.013%, Al≤0.010%, all the other are Fe; In laser beam welding, select helium to protect cooling as the protective gas butt welded seam;

3) after welding is accomplished, select again silicon content at the straight carbon steel 1.0% below or low grade non-oriented silicon steel as leader tape, repeat above-mentioned steps and realize production continuously.

Along with the increase of mother metal silicon content, splice that the plastic property of weld bead that reduces, the toughness variation, the intensity of weld seam can't guarantee steadily to pass through milling train.Therefore; Adopt the steel grade of above-mentioned two kinds of compositions to splice weldering, the silicon content of commissure material is reduced greatly, thereby significantly improve the plasticity and the toughness of weld seam as leader tape and mother metal; The intensity of welded seam area can effectively guarantee when rolling, satisfies the requirement of mill milling; Simultaneously because the welded seam area silicone content is compared many that high trade mark mother metal will be low, and the extensibility of weld seam is better, counter-bending, the stretch-proof and the resistance to compression ductility of weld seam can be better.

The composition of welding wire requires Si≤0.85%, and the silicone content of welding wire is most important in welding process, selects the low silicon content welding wire can further dilute the silicone content of welded seam area, thereby passes through the toughness of the chemical analysis increase weld seam of adjusting weld seam.

The laser power of laser welder is 5.0-9.0KW, to guarantee the penetration of weld seam; Speed of welding is 2.0 meters/minute-5.8 meters/minute, and the filling speed of welding wire is 3.0 meters/minute-5.8 meters/minute.The welding wire filling speed is shaped to guarantee weld joint stable a little more than welding machine speed;

Beneficial effect of the present invention:

The present invention is from the matching angle of weld seam and mother metal welding performance; Set about through aspects such as choose reasonable leader tape, welding wire, formulation welding procedure, control shield gas flow rates; Improve the aptitude to rolling of non-orientation silicon steel weld seam; Reduce the broken belt rate of weld seam, improved the non-orientation silicon steel weldquality of 1.0%-3.5% silicon content effectively.

Through on-the-spot actual verification, use welding procedure of the present invention, non-orientation silicon steel can be implemented in the continuous production of cold rolling unit smoothly, and logical plate is stable, and weld seam broken belt rate≤2 ‰ can be improved the production efficiency of cold rolling product line greatly.

The specific embodiment

By the present invention being further specified through embodiment.

Embodiment 1

1) selecting silicon content is 0.8% the low grade non-oriented silicon steel leader tape as laser weld; Selecting silicon content is 1.9% the non-orientation silicon steel mother metal as laser weld; The centering splicing after shearing of taking the lead with the magnetic tape trailer of leader tape and mother metal;

2) the laser welding process standard is welded by parameter in the table 1; Component of weld wire requires as shown in table 2.In the laser assembly solder process, select the helium of purity >=99.999% to protect cooling as the protective gas butt welded seam, shield gas flow rate (middle wind drift amount and side-blown flow) control is as shown in table 1.

3) after welding was accomplished, selecting silicon content again was that 0.8% low grade non-oriented silicon steel repeats above-mentioned requirements as follow-up leader tape and realizes producing continuously.

Table 1 laser weld and shield gas flow rate parameter control requirement

Table 2 is used for the component of weld wire requirement that wire filling laser welding connects

Composition

C

Mn

Si

S

P

Cr

Al

Fe

Content (wt%)

0.050

0.890

0.810

0.011

0.014

0.008

0.009

＞98.2

The invention provides the non-orientation silicon steel laser welding with filler wire method of a kind of silicon content in the 1.0%-3.5% scope, its weld seam can satisfy the requirement of cold-rolling mill quantity-produced.Adopt the weld seam bending resistance of technology of the present invention to significantly improve, broken belt rate is controlled in 2 ‰, can be widely used in the welding machine equipment that adopts laser silk filling technology, is particularly useful for adopting the cold rolling unit of silicon steel of technique for continuous rolling.

Claims (1)

1. non-orientation silicon steel laser welding with filler wire method, it comprises the steps:

1) with silicon content at the straight carbon steel below 1.0% or low grade non-oriented silicon steel leader tape as laser splicing weldering, at 1.0%～3.5% the non-orientation silicon steel mother metal as laser splicing weldering, above silicon content is all by weight percentage with silicon content; The centering splicing after shearing of taking the lead with the magnetic tape trailer of leader tape and mother metal; Said splicing gap is 0.10mm～0.30mm;

2) laser weld, the laser power of laser welder are 5.0～9.0KW, and speed of welding is 2.0 meters/minute～5.8 meters/minute, and the filling speed of welding wire is 3.0 meters/minute～5.8 meters/minute; The component of weld wire percentage by weight is: C≤0.10%, and Si≤0.85%, Mn≤0.98%, P≤0.015%, S≤0.015%, Cr≤0.013%, Al≤0.010%, all the other are Fe; In laser beam welding, select helium to protect cooling as the protective gas butt welded seam;

3) after welding is accomplished, select again silicon content at the straight carbon steel 1.0% below or low grade non-oriented silicon steel as leader tape, repeat above-mentioned steps and realize production continuously.