CN1827285A - Welding method for steel rail and ship deck - Google Patents

Abstract

The invention relates to a method for welding the steel rail and deck, which comprises: first, arranging the prepared support; then processing point welding, assembling, preheating, welding, heating, treating and detaching; detaching the rail in room temperature to be welded with the deck, while the connection is realized by sternum. The sternum and the deck are made from same material with better welding property. The invention has the advantages that: since the sternum is small with lower heat conductive speed, the rail and sternum can reach needed temperature before heating, to slow down the cooling speed of weld seam, and reduce the possibility and hardenability of martensite. And in heating, it can confirm the needed temperature of steel rail and sternum, to reduce the restrain stress of weld, to avoid the weld seam crack.

Description

The welding method of rail and ship deck

Technical field

The present invention relates to the welding method of a kind of rail and ship deck.

Background technology

The demand that be to adapt to social development, two industries of railway and boats and ships are intersected extension mutually, are exactly a new branch of ro-ro passenger ship as " train ferry ".

Up to now, in the train ferry that other shipyard is made, the U71Mn rail is placed directly on the ship deck and welds at home, after having welded, on the angle welding direction, crackle can occur, and, also not find the method that prevents that crackle from occurring so far in the longitudinal fracture of track.For this reason, they have used steel rail material instead, have used the 16MnRe steel instead by the U71Mn material, and the rail solderability of 16MnRe is relatively good, after directly having welded with ship deck, have avoided the appearance of Welding Crack and rail vertically to temper situation.But the 16MnRe rail has the drawback of a maximum, and its hardness and intensity are far below the U71Mn rail, and service time, long back 16MnRe rail was yielding.At this problem, also do not find the solution of external relevant this respect maturation at present.

Summary of the invention

For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide the welding method of a kind of U71Mn rail and ship deck, crackle that occurs on the angle welding direction when solving rail with the ship deck welding and track be the crack problem of appearance vertically.

For achieving the above object, the technical solution used in the present invention provides the welding method of a kind of rail and ship deck, and this method concrete operations step is as follows:

1., at first place prefabricated moulding bed;

2., spot welding: the good track 1 of will polishing on moulding bed assembles with web 2, and with CO2 welding wire DW-55E track 1 and web 2 is carried out spot welding;

3., assembling: track 1 is fixed on the moulding bed with dividing plate 4 every 600mm, and tightens with chock 5;

4., preheating: with flame track 1 is evenly heated from the middle to both ends on the both sides of track 1 respectively by the gas welder, heating-up temperature is 250 ℃～300 ℃;

5., welding: weld from the middle to both ends on the both sides of track 1 respectively by the electric welder;

6., postheating: with flame the track 1 that welds is heated from the middle to both ends on the both sides of track 1 respectively by the gas welder, heating-up temperature is 300 ℃～350 ℃, carries out air cooling then;

7., after welding treatment: use the asbestos insulation, temperature retention time: about 12 hours;

8., dismounting: air cooling to the track 1 of room temperature is pulled down and ship deck 3 welding, and the track 1 that will weld presses above-mentioned steps and circulate, refill and be fitted on the moulding bed.

Effect of the present invention is to adopt this welding method, utilize because the area of web is little, therefore heat-transfer rate is slow, during weld preheating, can guarantee that track and web reach required temperature, the cooling velocity of weld seam is slowed down, and martensitic possibility of generation and tendency of hardenability also reduce in the weld seam, thereby have reduced the possibility that weld seam cracks.During postheating, can guarantee the temperature that rail and web are required equally, both slow down the cooling velocity of weld seam, reduce again because the constraint stress that welding produces.Thereby avoid the generation of Welding Crack and the fracture of rail fully.

Description of drawings

Fig. 1 is the Welding Structure schematic diagram of rail of the present invention and web;

Fig. 2 for of the present invention weld behind the web rail with the Welding Structure schematic diagram on deck;

Fig. 3 is a moulding bed structural representation of the present invention;

Fig. 4 is track and web assembly structure schematic diagram on the moulding bed of the present invention;

Fig. 5 is the local enlarged diagram of Fig. 3.

Among the figure:

1, rail, 2, web, 3, ship deck

4, dividing plate 5, chock 6, moulding bed

The specific embodiment

Reaching embodiment in conjunction with the accompanying drawings is illustrated the welding method operating process of rail of the present invention and ship deck.

This method is the reason at U71Mn rail and deck of boat welded seam crackle and track longitudinal fracture, through repetition test, from reducing weld seam constraint stress angle, realize being connected of track and deck by web, its method is earlier track and web to be welded under ship, and then the track that will weld web is placed on the deck and welds.

Shown in Fig. 1,2,3,4,5, track 1 is as follows with the concrete operations step of web 2 welding:

1., at first place prefabricated moulding bed as shown in Figure 3;

2., spot welding: the good track 1 of will polishing on moulding bed assembles with web 2, and with CO2 welding wire DW-55E track 1 and web 2 is carried out spot welding, as shown in Figure 1;

3., assembling: track 1 is fixed on the moulding bed with dividing plate 4 every 600mm, and carries on the back tightly, as shown in Figure 4 with chock 5;

4., preheating: with flame track 1 is evenly heated from the middle to both ends on the both sides of track 1 respectively by the gas welder, heating-up temperature is 250 ℃～300 ℃;

5., welding: weld from the middle to both ends on the both sides of track 1 respectively by the electric welder;

6., postheating: with flame the track 1 that welds is heated from the middle to both ends on the both sides of track 1 respectively by the gas welder, heating-up temperature is 300 ℃～350 ℃, carries out air cooling then;

7., after welding treatment: use the asbestos insulation, temperature retention time: about 12 hours;

8., dismounting: air cooling to the track 1 of room temperature is pulled down and ship deck welding, and as shown in Figure 2, and the track 1 that will weld presses above-mentioned steps and circulates, and refills to be fitted on the moulding bed.

This method welding operation:

1., joint geometry:

Welding method: FCAW (CO ₂The gas shield semiautomatic welding)

Welds types: corner connection

Single welding or welding by both sides: single welding

Whether the back side back chipping: not

2., mother metal

Material trademark: the U71Mn+A step,

Material specification: U71Mn:70mm * 70mm

A step: 10mm * 70mm

3., fill metal:

Fill the metal trade mark: DW-55E

Fill compliant metal: φ=1.4mm

4., gas shield:

Protective gas: CO2

Gas flow: the 20-25 liter/minute

5., welding position:

Angle welding position: horizontal position welding

6., preheating:

Preheat temperature: 250 ℃～300 ℃

Pre-heating mean: flame heat

Interlayer temperature: can not be greater than 300 ℃

Single track or multiple tracks: multiple tracks

Whether interlayer is cleared up: be.

The welding conditions of concrete welding parameter according to the form below:

Claims (1)

1, the welding method of a kind of rail and ship deck, this method concrete operations step is as follows:

1., at first place prefabricated moulding bed;

2., spot welding: the good rail (1) of will polishing on moulding bed assembles with web (2), and with CO2 welding wire (DW-55E) rail (1) and web (2) is carried out spot welding;

3., assembling: track (1) is fixed on the moulding bed (6) with dividing plate (4) every 600mm, and tightens with chock (5);

4., preheating: with flame track (1) is evenly heated from the middle to both ends on the both sides of track (1) respectively by the gas welder, heating-up temperature is 250 ℃～300 ℃;

5., welding: weld from the middle to both ends on the both sides of track (1) respectively by the electric welder;

6., postheating: with flame the track (1) that welds is heated from the middle to both ends on the both sides of track (1) respectively by the gas welder, heating-up temperature is 300 ℃～350 ℃, carries out air cooling then;

7., after welding treatment: use the asbestos insulation, temperature retention time: about 12 hours;

8., dismounting: air cooling to the track (1) of room temperature is pulled down and ship deck (3) welding, and the track that will weld (1) presses above-mentioned steps and circulate, refill and be fitted on the moulding bed.

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