CN201012424Y

CN201012424Y - Welding gun double-layer protection nozzle

Info

Publication number: CN201012424Y
Application number: CNU2006201336449U
Authority: CN
Inventors: 张轩; 涂勇; 李雪妍; 李新运
Original assignee: Guizhou Yonghong Aviation Machinery Co Ltd
Current assignee: Guizhou Yonghong Aviation Machinery Co Ltd
Priority date: 2006-12-29
Filing date: 2006-12-29
Publication date: 2008-01-30
Anticipated expiration: 2016-12-29

Abstract

The utility model discloses a double-layer protecting nozzle of a welding torch and belongs to a welding torch nozzle. The utility model aims to provide welding torch nozzle, which can not only effectively improves the melting depth of a TIG welding seam, but also enhance the air protection effect with the same technical welding art. The utility model comprises a nozzle, which is formed by a funneled internal nozzle (1) fixed in a funneled external nozzle (4). An annular chamber (5), which is closed at one end and opened at the other end, is arranged between the internal nozzle (1), which is provided with internal threads (2), and the external nozzle (4). A ring of bypass holes (3), which communicates with the chamber (5), are evenly distributed on the oblique circumferential wall of the internal nozzle (1). A lower port of the internal nozzle (1) stretches out of a lower port of the external nozzle (4). The utility model is simple in the structure and convenient for use. With the utility model, good welding quality will be achieved. The utility model can be directly used with all types of prior TIG welding torches.

Description

Double layers of arc welding gun protecting spray nozzle

Technical field:

The utility model relates to a kind of welding gun nozzle, relates in particular to the nozzle that a kind of TIG welding gun is used.

Background technology:

When utilizing the arc welding weld metal, particularly during non-ferrous metal such as welding of aluminum, magnesium, titanium, because the metal of high temperature is easy to absorb airborne O ₂, CO ₂, N ₂Or H ₂Deng gas and react, thereby influence the quality of weld seam, therefore, the protection of reinforcement of weld just seems and is even more important during welding.At the problems referred to above, the measure that prior art is taked is: apply protective gas by torch neck, make protective gas concentrate on the front end of electrode and form laminar flow layer, by protective gas weld seam and ambient air are isolated.

At present, what known TIG torch neck adopted is single layer structure, according to the nozzle of the optional majority kind of different demands internal diameter.The orifice gas protection effect that general internal diameter is big is better, but the electric arc compression a little less than, weld penetration is also relatively poor; And the little nozzle of internal diameter, the electric arc compression is stronger, and the fusion penetration of weld seam is better, but the gas shield effect is relatively poor; Can't eat one's cake and have it.For this reason, when the bigger product of throat thickness,, often need to take the process of multilayer welding in order to obtain weld penetration and excellent protection effect preferably simultaneously; But this can cause again the weld seam interlayer temperature control difficulty, be easy to generate crack defect etc., not only higher but also increase production cost, reduce production efficiency to welding process requirement, also limited the scope of application of TIG simultaneously.

Summary of the invention:

At the above-mentioned defective that exists in the prior art, the utility model aims to provide a kind of fusion penetration that can either effectively improve the TIG weld seam under equal welding condition, can strengthen the double layers of arc welding gun protecting spray nozzle of gas shield effect simultaneously again.

To achieve these goals, the utility model by the following technical solutions: it comprises nozzle; Described nozzle is fixed in the funnelform outer nozzle by funnelform inner nozzle and constitutes, upper port is provided with and forms one one end sealing, ring-like die cavity that the other end is uncovered between the inner nozzle of internal thread and the outer nozzle, be evenly equipped with the tap hole that a circle is communicated with die cavity on the circumferential wall that inner nozzle tilts, the lower port of inner nozzle is stretched out from the lower port of outer nozzle.

Tap hole is 9～18; The diameter of tap hole is 0.5～1.0mm.

Compared with the prior art; the utility model is owing to changed traditional TIG torch neck into double-decker by single layer structure; make and form a die cavity between the inner and outer nozzles; simultaneously; on the hopper walls of inner nozzle, set up the tap hole that a plurality of and described die cavity is communicated with; therefore the protective gas that sprays from welding gun sprays from inner and outer nozzles respectively under the effect of tap hole and forms double shielding gas laminar flow, thereby realizes the protection of butt welded seam.Simultaneously, electric arc is more concentrated under the inner nozzle compression of minor diameter, can increase the fusion penetration of weld seam effectively; And protective gas has enlarged protection domain under the effect of large diameter outer nozzle, can strengthen the protection effect of weld seam.

Be below under same welding condition, adopt the utility model and traditional TIG torch neck respectively to weld the obtained contrast test data of main weld of 120 cover aluminium alloy heat radiators respectively: (the thickness of workpiece of welding: 6～8mm)

Table 1: when adopting the utility model and conventional spout welding product, the fusion penetration of weld seam and efficient contrast situation

	The TIG torch neck	The utility model
	The TIG torch neck	The utility model	The fusion penetration of one-pass weld (mm)	3.0～3.5	4.0～5.0
Finish the required time of 120 covers (hour)	80	50	The fusion penetration of one-pass weld (mm)	3.0～3.5	4.0～5.0

Table 2: the product that adopts the utility model welding is carried out the burst strength sampling test

Product quantity (cover)	Burst strength (Mpa)					Qualification rate
Product quantity (cover)	Burst strength (Mpa)					Qualification rate	5	10.2	10.0	9.8	9.5	9.7	100％

Table 3: the product that adopts the utility model welding is carried out fatigue strength sampling test (frequency: 2Hz, pressure: 1.6Mpa)

Product quantity (cover)	Fatigue strength (vibration number)		Qualification rate
Product quantity (cover)	Fatigue strength (vibration number)		Qualification rate	2	1500000	1600000	100％

From above-mentioned result of the test as can be seen, the utility model (burst strength: 7.0Mpa under the prerequisite that satisfies the weld strength requirement; Fatigue strength: 1000000 times), not only can increase the fusion penetration of weld seam effectively, and can also play a good protection, improve weldquality by butt welded seam; Simultaneously also simplify welding production technology, nearly boosted productivity 50%.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the intention of overlooking of Fig. 1.

Among the figure: inner nozzle 1 internal thread 2 tap holes 3 outer nozzles 4 die cavities 5

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:

In Fig. 1～2, nozzle is fixed in the funnelform outer nozzle 4 by funnelform inner nozzle 1 and constitutes, and inner nozzle 1, outer nozzle 4 are connected to become a funnelform integral body by the frustum of a circular ring type with two annulus; The upper port of inner nozzle 1 is provided with the internal thread 2 suitable with the TIG welding gun, lower port is stretched out from the lower port of outer nozzle 4.Between inner nozzle 1 and outer nozzle 4, form the ring-like die cavity 5 that one one end seals, the other end is uncovered, on the circumferential wall that inner nozzle 1 tilts, be evenly equipped with the tap hole 3 that a circle is communicated with die cavity 5.As required, tap hole 3 is the amount doesn't matter, but thinks that generally 9～18 are advisable, and its diameter is 0.5～1.0mm.

The main effect of inner nozzle 1 is compression arc, increases fusion penetration, but simultaneously also butt welded seam implement second protection; The effect of outer nozzle 4 is that butt welded seam is implemented elementary protection.This shows, owing to protective gas from outer nozzle 4 ejection has been arranged as elementary protection, therefore the harmful gas of butt welded seam become thinner around being distributed in inner nozzle 1, also can keep higher purity, flow velocity and intensity from the protective gas of inner nozzle 1 ejection, welding process is had stronger secondary protective effect; In addition, 1 pair of electric arc of inner nozzle also has very strong compression, and it can make the electric arc firmness increase, and the fusion penetration that increases weld seam has been played good effect.The employed material of the utility model can adopt refractory ceramics, red copper and quartz respectively according to the difference of welding current.The utility model of general refractory ceramics processing requires welding current less than 350A; The utility model welding current of red copper processing can reach 500A, but need to increase insulation sleeve nozzle and current-carrying part is isolated.

Claims

1. a double layers of arc welding gun protecting spray nozzle comprises nozzle; It is characterized in that: described nozzle is fixed in the funnelform outer nozzle (4) by funnelform inner nozzle (1) and constitutes, upper port is provided with and forms one one end sealing, ring-like die cavity (5) that the other end is uncovered between the inner nozzle (1) of internal thread (2) and the outer nozzle (4), be evenly equipped with the tap hole (3) that a circle is communicated with die cavity (5) on the circumferential wall that inner nozzle (1) tilts, the lower port of inner nozzle (1) is stretched out from the lower port of outer nozzle (4).

2. double layers of arc welding gun protecting spray nozzle according to claim 1 is characterized in that: tap hole (3) is 9～18.

3. double layers of arc welding gun protecting spray nozzle according to claim 1 and 2 is characterized in that: the diameter of tap hole (3) is 0.5～1.0mm.