Welding process method of adding cobalt-based hardened layer on opening pipeline end portion

Abstract

The invention discloses a welding process method of adding a cobalt-based hardened layer on an opening pipeline end portion. The welding process method includes the steps that S1, an end plate is provided, and the front surface of the end plate forms the cobalt-based hardened layer which is adaptive with the inner hole shape of an opening pipeline through bead welding of cobalt-based welding materials; S2, a side wall opening, an axial-direction opening surface and an arc opening surface are subjected to bead welding through the cobalt-based welding materials; and S3, the end plate is placed at an end portion opening of a pipeline and welding and fixing are carried out after the edge of a cobalt-based layer is matched with the end portion opening and an side surface opening of the pipeline. According to the welding process method of adding the cobalt-based hardened layer on the opening pipeline end portion, the cobalt-based hardened layer can be added on the opening pipeline end portion, and the quality of the cobalt-based hardened layer can be ensured to meet the demands.

Description

technical field [0001] The invention relates to a welding process method, in particular to a welding process method in which a cobalt-based hardening layer is added to the end of an open pipe. Background technique [0002] The deposited metal of cobalt-based hardened layer welding consumables has high strength and high hardness, and is prone to hot cracks or cold cracks. If the crack depth extends below the surface of the base metal, the surfacing welding product is unqualified. And for the detection of product crack depth, there is no cost-effective method at present. For some pipelines, the requirements for wear resistance are high, and it is necessary to use cobalt-based hardening layer to increase the wear resistance effect of the pipeline. [0003] The open pipe end mentioned in the present invention refers to that the circular pipe end opening has an end opening, and the end side wall of the pipe also has a side wall opening; the end opening needs to weld the end plat...

AI Technical Summary

Problems solved by technology

[0003] The open pipe end mentioned in the present invention refers to a circular pipe end opening with an end opening, and the end side wall of the pipe also has a side wall opening; the end opening needs to be welded with an end plate, and the side wall opening It is used to change the flow direction of materials. However, it is more difficult to add cobalt-based hardening layer to open pipes of this shape. It is easy to cause deformation of surfacing parts, cracking on the surface of surfacing layer, and cracking on the surface where the surfacing layer intersects at right angles. It is difficult to ensure hardening Quality of Hard Layer Parts

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