Thermal treatment device and welding system

A heat treatment device and welding system technology, applied in heat treatment furnaces, heat treatment equipment, welding equipment, etc., can solve problems such as softening of welded joints, increased welding deformation, and decreased strength

CN103028851BActive Publication Date: 2015-07-15ZOOMLION HEAVY IND CO LTD
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-07-15

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a welding method, which comprises the following steps: a welding step of welding parent materials (10) together and forming a welding joint (11); a thermal treatment step: cooling the material at the welding joint (11) from a predetermined temperature (T) to a lower bainite transformation-starting temperature (T0) of the parent materials (10); keeping the temperature of the material at the welding joint (11) to the lower bainite transformation-starting temperature (T0), wherein the heat preservation time is predetermined time (t). The invention further discloses a thermal treatment device (100) for carrying out the thermal treatment step and a welding system for carrying out the welding method. During welding, the welding joint is cooled to the bainite transformation-starting temperature for not generating a martensitic structure at the welding joint, so that the cold crack sensitivity of the welding joint is improved; and mechanical properties of the joint are improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the field of welding, and in particular, relates to a heat treatment device for performing a post-welding heat treatment step and a welding system for performing welding and a post-welding heat treatment step. Background technique

[0002] With the large-scale and heavy-duty of modern construction machinery, more and more high-strength steel welded structures are applied to construction machinery. However, due to the high-strength steel contains more carbon and alloy elements, and the carbon equivalent is higher, the welded joint is easy to form a hardened structure when it is naturally cooled, which reduces the mechanical properties of the welded joint and increases the sensitivity to cold cracks, which seriously restricts Application of high-strength steel in welded structures.

[0003] In order to avoid the generation of hardened structure, the base metal to be welded is usually preheated before welding, and post-we...

Examples

Embodiment Construction

[0052] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0053] As an aspect of the present invention, such as figure 1 As shown, a welding method is provided, wherein the method includes:

[0054] Welding step: welding the base metals 10 together to form a welded joint 11;

[0055] Heat treatment step: make the material at the welding joint 11 place from a predetermined temperature T 1 Cooling to the lower bainite transformation temperature T of base metal 10 0 , to keep the temperature of the material at the weld joint 11 at the lower bainite transformation temperature T 0 , the holding time is the predetermined time t.

[0056] The lower bainite transformation temperature T of the material 0 It is higher than t...