A method for improving weld seam structure of titanium and titanium alloy plates
A technology for titanium alloys and plates, which is applied in the field of improving the structure of the weld seam of titanium and titanium alloy plates, and can solve the problems of complex hammer forging equipment and the like.
Active Publication Date: 2020-06-23
BAOJI FANMEI MATERIAL TECH
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Problems solved by technology
This method has two disadvantages: one is that the equipment for counter forging is complicated, and the other is that a heat treatment close to the transformation point is required in the middle
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[0014] combined with figure 1 A first embodiment of the present invention will be described.
[0015] Step 1: Make a symmetrical double "V" groove at the butt end weld of the TA2 titanium plate with a thickness of 12 mm, the groove angle is 45 degrees, and then weld the weld by electron beam welding or plasma welding. And the weld is lower than the surface of the plate (commonly known as under-high welding), and the width of the weld is as narrow as possible, and the length of the weld is about 1500 mm;
[0016] Step 2: Use flame heating or resistance heating to locally heat the weld, control the temperature between 800 and 840°C (the phase transition point of the plate is 890°C), keep the heating time as short as possible, and take cooling measures for the non-heating area. Then, on a 1000-ton press, press down forging by 10 mm to upset the weld, so that the deformation of the weld is greater than 30%, and then use milling to remove the protruding part of the plate around th...
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The invention provides a titanium and titanium alloy plate weld joint tissue improvement method. The method comprises the steps of a, forming a symmetric double-v-shaped groove in the weld joint of atitanium and titanium alloy plate butt-joint end, wherein the angle of the groove is 30-60 degrees; welding the weld joint, and keeping the width of the weld joint to be narrow as much as possible; b,locally heating the weld joint, and controlling the heating temperature to be 750-950 DEG C, upsetting the weld joint to enable the deformation amount of the weld joint greater than 30%, removing parts which protrude out of the plate around the weld joint by adopting the mechanical machining method, and aligning the weld joint to be flush with the plate. According to the invention, protruded parts formed after the weld joint upsetting operation are removed in the mechanical processing mode. Through removing most of lightly deformed parts in the weld joint and the heat affected zone, largely deformed parts in the weld joint tissue and the heat affected zone are reserved. Through one or multiple times of deformation operation, the weld joint tissue and the heat affected zone can be changedinto a two-phase zone processing structure.
Description
technical field [0001] The invention belongs to the technical field of weld seam treatment, and in particular relates to a method for improving weld seam structure of titanium and titanium alloy plates. Background technique [0002] In the manufacture of titanium equipment, welding between sheets is required. As we all know, the weld is a high-temperature structure, which is not as good as the two-phase zone processing structure in terms of performance and corrosion resistance. When designing general equipment, the weld coefficient should be considered, that is, the thickness should be thickened according to the conditions of use. However, in some cases, it is required that no high-temperature structure appears, so the weld seam must be treated, such as the cathode roller. The applicant proposed a method in the previous patent ZL200410026157.8. After the welding seam is thickened, the raised part of the welding seam is forged flat, then heated again, and then upset. Conve...
Claims
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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 胡宗式佟大新
Owner BAOJI FANMEI MATERIAL TECH