2.2 mild steel and high strength steel with solid wire

The study of solid wire only study on the wire itself, more is to wire and shielding gas, welding power combined research. The pulse arc welding and gas activity in Datong has developed a soft steel 490MPa grade high strength steel with pulsed reactive gas shielded arc welding wire together, inhibition of the welding spatter. The reason is that due to increased pulse peak current rate of decline, the pulse frequency increased (to enhance the skin effect, the current focus on the wire surface, so that the electromagnetic contraction increased droplet moving smoothly) and will mainly contain alkali metal Oil coating the surface of the wire to suppress splash effect. This wire can also be used to improve the welding operation environment.

During automatic welding of automotive sheet production line, the above requirements in addition to reducing spatter, also required to reduce welding fumes, soldering and welding wire burn the Department of intermittent and other welding defects. Therefore, the wire will continue efforts to develop an important work.

2.3 ferritic stainless steel weld material

In the automotive industry, due to stringent worldwide exhaust requirements and improve the fuel efficiency of the requirements, the requirements of the automotive lightweight growing in the exhaust system components, the need for corrosion resistance, heat resistance and better parts .

Automobile exhaust manifolds exhaust system has been changed by the greater use of the casting sheet welded structure, therefore, to promote ferritic welding research and development.

Datong has developed both a good high temperature strength and corrosion resistance, but also has good operational ferritic welding wire, which, on the plated surface of the Cu wire "WSR" series wire has been commercialized for many parts of the of welding. Table 1 lists the new brand development and chemical composition of welding wire. "WSR series" wire to wire WSR42K as the basic and high-temperature performance and improve WSR42KM, improve corrosion resistance WSR35K, grain refinement of weld metal has good resistance to weld cracking and other form of WSR42KF series products.

Table 1 Chemical composition of newly developed wire.

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Welding parts welding C Si Mn Cr Nb Mo Other Notes

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Exhaust manifold WSR42K 0.01 1.03 0.45 18.7 0.18 - - Basic Performance

WSR42KM 0.01 1.01 0.45 20.7 0.16 0.50 -

Improved high temperature performance

WSR42KF 0.01 1.12 0.46 18.4 0.40 0.50 Al, Ti, N grain refinement

Exhaust manifold WSR35K 0.01 0.44 0.30 17.0 0.50 - - to improve corrosion resistance

Exhaust manifold

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WSR series is unique in the Tatung ferritic stainless steel coated wire production equipment on the volume manufacturing. The device automatically lift the scales for electrical wire, coating, finishing wire drawing, coiling and other operations. Bus electrolytic pickling by H2SO4 to remove oxide scale, in order to improve the plating adhesion layer of Cu, Ni plating on the impact of the implementation process, and then, followed by side-plated Cu, Roberts and the use of hand finishing reel take-up.

2.4 Titanium with wire

Electric arc welding Ti material methods, TIG welding (tungsten inert gas shielded arc welding), MIG welding (melting inert gas welding) and plasma welding. TIG welding method which is generally the most commonly used method. But its drawback is low productivity. As a result, Tatung Company to ensure production efficiency based on the high-Ti material MIG welding method, developed for the welding of the wire.

The original subject of the Ti wire material has been studied, using the wire surface oxygen-rich layer, and adjust the tensile strength wire method, developed for MIG welding wire of Ti material "G-coat".

2.4.1 the delivery of the wire

Newly developed welding wire feed load is less than traditional wire, wire feed can hold. In addition, a newly developed tensile strength wire itself, the vertical wire bending phenomenon disappeared.

2.4.2 welding arc and the stability of droplet movement

Compared to conventional wire, the newly developed directional stability of arc welding wire available. Moreover, the new development within the pulse wire in a droplet completely out, and almost all of the traditional wire droplet several times a pulse (2 ~ 10 times) in order not to continuously separated from the resulting droplet grew up.

Because of the above problems, the use of newly developed narrow wire get a good weld. Good mechanical properties of welded joints, and TIG welding fairly. As the newly developed wire transfer good performance, making this wire can be used to feed the wire path strict action complex robotic welding, and, under the direction of welding can get a good weld. In addition, more than 4mm thick plate welding, fillet, etc. can be accomplished in a pulse, greatly reducing the welding time, so that new development is expected to further expand the use of wire.

In the automotive and semiconductor industry, driven by the smooth development, there has been increasing application of laser welding and arc welding, hybrid welding method combination can be expected, the newly developed welding wire due to further improve the speed, the hybrid welding method will be applied .

3. welding • Bonding

Welding • There are many types of joining techniques. • bonding by welding is generated when the classification phase can be divided into melt bonding, liquid - solid phase and solid phase reaction bonding legitimate three categories. Each method can be further classified into more methods. In addition, the welding • bonding • bonding with a variety of welding equipment, simulation technology and detection techniques are closely related.

3.1 liquid - solid phase reaction and solid-phase bonding technology combined technology

3.1.1 Overview

Liquid - solid reaction bonding process with liquid brazing and diffusion bonding. Solid phase bonding process with friction crimping, friction stir bonding, crimping at room temperature, weld, crimp the explosion and ultrasonic methods such as crimping. This section of the liquid phase diffusion bonding and the recent application of friction stir joining the growing trend of development are described.

3.1.2 The liquid phase diffusion bonding

Liquid phase diffusion bonding is embedded into the material in the joints, in the embedded material does not melt the base metal melting state of the workpiece bonding method. Liquid phase diffusion bonding for precision parts, components of complex shape, special materials, components and bonding of dissimilar materials.

Liquid phase diffusion bonding can be carried out under relatively low temperature bonding, the advantage is due to the increased role of the liquid phase of adhesion joints. The method is suitable for gas turbines and jet engines in some parts of the joints. Liquid phase diffusion bonding of dissimilar materials bonding in terms of bonding is a very effective method for welding difficult to melt 0 Ti alloy and steel joints. This combination of technology, Tatung has been used in the manufacture of automotive turbine turbine.