Submerged arc bead welding technique

A submerged arc welding and technical technology, applied in the field of surfacing, can solve the problems of insufficient high temperature resistance, affecting production, adhesion, etc., and achieve the effect of improving product production quality and saving production costs

CN101549424AInactive Publication Date: 2009-10-07CHANGZHOU JINAN METALLURGICAL EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2009-10-07
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a submerged arc bead welding technique which comprises the following steps: the outer surface of the bead welding body is machined to be a certain smaller thickness, a fatigue layer, defects or cracks on the bead welding body surface are removed, and the bead welding body is pre-heated, when the temperature reaches about 250 DEG C, NH-69S is used as the welding material, the bead welding body is rolled-position welded under certain conditions of welding parameters, the welded bead welding body is cooled down to 100 DEG C and kept for a certain period of time, and continue to cool down below 50 DEG C, after that the cooling rate is not controlled, the gained bead welding body is processed for tempering, and finally the bead welding body after tempering is slowly cooled down with the furnace. The submerged arc bead welding technique has the advantages that the bonding problem between the steel coil and the cradle roll is solved by using the bead welding technique, the production costs are saved, and the production quality of the product is improved.
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Description

technical field

[0001] The invention relates to surfacing welding technology, in particular to a submerged arc welding surfacing welding technology. Background technique

[0002] In the prior art, many surfacing materials, especially the roll body material of the supporting roll, use No. 35 steel. Due to the lack of high-temperature resistance of the No. 35 steel material, its surface is often in contact with high-temperature and large-tonnage steel coils during work. As a result, the roller body and the surface of the steel coil are bonded, which affects production. Contents of the invention

[0003] The purpose of the present invention is to provide a submerged arc welding surfacing welding technology.

[0004] A submerged arc welding surfacing welding technology, comprising the steps of:

[0005] (1) Reduce the outer surface of the surfacing welding by 8 to 10 cm;

[0006] (2) Removing the fatigue layer, defects or cracks on the surface of the surfacing body; [000...

Examples

Embodiment 1

[0016] A submerged arc welding surfacing welding technology, comprising the steps of:

[0017] (1) Reduce the outer surface of the idler roller by 8cm;

[0018] (2) Remove the fatigue layer, defects and cracks on the surface of the roller;

[0019] (3) The idler roller is first heated to 100°C at a rate of 20°C / h, and then preheated to 250°C at a rate of 40°C / h;

[0020] (4) Under the conditions of welding voltage of 20V, welding current of 900A and welding speed of 70mm / min, NH-69S is used as the welding material, and the angular velocity of the supporting roller is controlled to be 15rad / s for rotational welding ;

[0021] (5) Cool the welded idler roll to 100°C and keep it warm for 20 minutes, then continue cooling to below 50°C, and then no longer control the cooling speed;

[0022] (6) Keep the idler roller obtained in the above steps at a tempering temperature of 450° C. for 5 hours;

[0023] (7) Finally, slowly cool the tempered idler rollers to 150°C with the furna...

Embodiment 2

[0025] A submerged arc welding surfacing welding technology, comprising the steps of:

[0026] (1) Reduce the outer surface of the roller by 10cm;

[0027] (2) Remove the fatigue layer, defects and cracks on the surface of the roller;

[0028] (3) Raise the idler roller to 100°C at a speed of 20°C / h, and then preheat at a speed of 40°C / h to make the temperature reach 300°C;

[0029] (4) Under the conditions of welding voltage 30V, welding current 1000A, welding speed 80mm / min, NH-69S is used as welding material, and the angular speed of the idler is controlled at 20rad / s for rotational welding ;

[0030] (5) Cool the welded idler roller to 100°C and keep it warm for 30 minutes, then continue cooling to below 50°C, and then no longer control the cooling speed;

[0031] (6) Keep the idler roller obtained in the above steps at a tempering temperature of 600° C. for 6 hours;

[0032] (7) Finally, the tempered surfacing body is slowly cooled to 150°C with the furnace and then a...