CN102626839A

CN102626839A - Active agent for titanium alloy tungsten electrode argon arc welding

Info

Publication number: CN102626839A
Application number: CN2011103777719A
Authority: CN
Inventors: 黄勇; 何成旦; 吴飞虎
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2011-11-24
Filing date: 2011-11-24
Publication date: 2012-08-08

Abstract

The invention discloses an active agent for titanium alloy tungsten electrode argon arc welding, which aims to increase the weld penetration, reduce the input of welding heat, thin a weld structure and reduce the weld porosity. In percent by weight, the active agent comprises the following components: 20-30% of CaF2, 10-20% of CrCl3, 10-20% of KF and 40-50% of Te.

Description

A kind of activating agent that is used for the titanium alloy argon tungsten-arc welding

Technical field

The present invention relates to active welding method.

Background technology

Advantages such as titanium alloy has that density is little, specific strength is high, good corrosion resistance and good biocompatibility; In the application in fields such as Aero-Space, shipbuilding, the chemical industry energy and therapeutic physical education apparatus more and more widely; Especially at aerospace field, its consumption reaches 70% of titanium material total amount.At present, the most frequently used method of welding titanium alloy is argon tungsten-arc welding (TIG weldering, Tungsten Inert Gas Welding), and almost the welding of the titanium alloy structure more than 95% all is to adopt this method to accomplish at home.It has that process margin is big, Technological adaptability is strong and numerous advantages such as weldquality height; But because TIG arc energy density is low, penetration capacity is relatively poor, causes the single-pass welding fusion penetration shallow, welding efficiency is low; Again because the titanium alloy fusing point is high, thermal capacity is big, resistivity is high and thermal conductivity is low; Cause that easily the weld zone is overheated, crystal grain is thick, cause joint plasticity to reduce and the welding deformation increase, thereby influenced property of welded joint and Welding Structure life-span.

Summary of the invention

The objective of the invention is to increase weld penetration, reduce the sweating heat input, the refinement seam organization reduces the welding pore.

The present invention is a kind of activating agent that is used for the titanium alloy argon tungsten-arc welding, and by weight percentage, its component is: CaF ₂20～30%, CrCl ₃10～20%, KF 10～20%, and Te 40～50%.

Utilize activating agent of the present invention to carry out titanium alloy T IG weldering, can shrink electric arc very effectively, the weld penetration that is multiplied significantly improves welding production efficiency.For same thick sheet material, can obviously reduce the input of sheet material heat, improve the weld seam microscopic structure, reduce welding deformation.Simultaneously, owing to contain halide component in the activating agent, can effectively eliminate the welding pore during welding.

Description of drawings

Fig. 1 is the TiG welding line cross-sectional picture of embodiment 1; Fig. 2 and Fig. 3 are respectively the A-TIG welding line pattern photo of embodiment 1, and wherein Fig. 2 is the surface topography of weld seam, and Fig. 3 is the cross section pattern of weld seam; Fig. 4 is the A-TIG welding line cross-sectional picture of embodiment 3; Fig. 5 is the A-TIG welding line x-ray inspection photo of embodiment 3; Fig. 6 and Fig. 7 are respectively the weld seam microstructure picture of embodiment 3, and wherein Fig. 6 is the weld seam microscopic structure of TIG weldering, and Fig. 7 is the weld seam microscopic structure of A-TIG weldering.Fig. 8 is the test specimen photo after the weld seam tension test of embodiment 3.

The specific embodiment

With the titanium alloy TC 4 is example, and sheet metal thickness is 8mm.Before the welding, outwash welding bead to be welded surface to remove surface and oil contaminant, is brushed with finer wire, with absolute ethyl alcohol wiping surface of the work till exposing metallic luster by elder generation.Then, activating agent is used acetone solution, be coated in surface of the work equably with hairbrush after stirring into pasty state, be advisable to hide original metallic luster.Treat to carry out after acetone volatilizees fully conventional TIG weldering.

Embodiment 1:

Carry out straight polarity direct current A-TIG weldering, weld procedure specification is as shown in table 1.When the welding variables of employing table 1 was welded, the weld penetration of traditional TIG weldering was 1.7mm, and molten wide is 9.2mm, and seam cross-section is as shown in Figure 1.And the welding conditions of employing table 1 are carried out A-TIG when weldering, and active agent formulation and weld penetration melt wide as shown in table 2.

Table 1 welding variables

Table 2 active agent formulation and weld penetration are molten wide

Can find out that from table 2 adopting activating agent of the present invention to carry out titanium alloy A-TIG weldering can significantly increase weld penetration.Especially No. 2 test specimens, fusion penetration reach 2.3 times of conventional TIG weldering, and welding seam deep width ratio reaches 0.58, and face of weld is distinguished as shown in Figures 2 and 3 with cross section.

Embodiment 2:

Carry out straight polarity direct current A-TIG weldering, the composition of the activating agent of employing and mass percent thereof are CaF225%, and CrCl3 15%, and KF 10%, and Te 45%.The tungsten electrode diameter that welding is selected for use is 3.2mm, and the tungsten electrode tip angle is 45 °, and other welding variables and weld penetration are molten wide as shown in table 3.

Table 3 welding variables and weld penetration are molten wide

Embodiment 3:

Carry out straight polarity direct current A-TIG weldering, welding conditions are as shown in table 4, and the composition of the activating agent of employing and mass percent thereof are CaF ₂25%, CrCl ₃15%, KF 10%, and Te 45%.Seam cross-section is as shown in Figure 4,2.94 times of TIG when weld penetration reaches identical specification parameter weldering.Weld seam x-ray inspection photo is as shown in Figure 5, and weld seam does not exist crackle, incomplete fusion, bar defect and circular flaw (like pore).The weld seam chemical composition is as shown in table 5.When the welding conditions of employing table 4 were welded, the weld seam microscopic structure of TIG weldering and A-TIG weldering was respectively like Fig. 6 and shown in Figure 7, and activating agent has played the effect of crystal grain thinning.Carry out the weld seam tension test, welding seam breaking is in mother metal, and is as shown in Figure 8, and intensity is higher than the TIG welding line under the same weld standard.Carry out the weld seam corrosion resistance test by standard GB/T 4334-2008, the result is as shown in table 6, satisfies the industry standard requirement.

Table 4 welding variables

Table 5 weld seam chemical composition (wt, %)

Table 6 corrosion test result

Claims

1. activating agent that is used for the titanium alloy argon tungsten-arc welding, by weight percentage, its component is: CaF ₂20～30%, CrCl ₃10～20%, KF 10～20%, and Te 40～50%.