CN2507603Y - Metal nozzle using ceramic as lining - Google Patents

Abstract

A welding gun of a gas protecting metallic arc welding substantially adapts metal to be a nozzle. The problem such as how to reliably insulate with a gun body exists and the welding gun is easy to destroy by the arc welding. The nozzle of the utility model has an inner layer and an outer layer. The outer layer is a metal shell (2) and the inner layer is a ceramic nozzle (1). The external diameter of the ceramic nozzle (1) is a little bigger than the inner diameter of the metal shell (2) and the ceramic nozzle (1) which is coated with thermostable glues (3) on the outer circle is strong-pressurizing inserted into the metal shell (1). The ceramic nozzle (2) has huge compression stresses, dangerous pulling stresses cannot be generated by uneven heating or collision and damage cannot be caused, thereby improving the reliability of the blast gun and the welding gun.

Description

With the pottery is the metallic nozzle of liner

The utility model belongs to the welding auxiliary equipment, a part of gas shielded arc welding welding, be mainly used in the gas shielded arc welding consumable electrode automatically and semi-automatic arc weld connect.

In the gas shielded arc welding welding gun, nozzle is subjected to the heat intensive of electric arc.In the non consumable arc welding electrode welding, nozzle is generally all made with pottery.But in the consumable electrode welding, ceramic nozzle is very easy to damage, and therefore generally all makes with metal.But how the nozzle that metal is done exists the problem that insulate reliably with the rifle body, and itself also is easy to be burnt out by electric arc.

Although why ceramic nozzle is very easy to damage is because pottery has very high compression strength, unusual tension not.Its tensile strength only is 1/10th of its compression strength.If temperature will tension occur in some place not exclusively even everywhere when nozzle is heated.When being subjected to accidental collision in welding process, nozzle also can produce tension.At this moment nozzle will break, and shows to such an extent that be highly brittle.

Nozzle is not broken, will manage to make it all to avoid occurring tension in all cases.

The purpose of this utility model is that a kind of cermet combining nozzle that is used for gas metal-arc welding will be provided, and wherein can not produce tension in the pottery, is difficult for breaking, and therefore has higher service life.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is nozzle figure of the present utility model.

Fig. 2 is that another implements structure.

Fig. 3 is the another kind of structure of implementing.

(1) is ceramic mouth in Fig. 1.Its inside has screw thread to may be screwed to the rifle body to get on.(2) be metal shell.The cylindrical of pottery mouth (1) has certain dimension, and is upper coarse and lower fine.The external diameter of pottery mouth (1) is more bigger than the internal diameter of metal shell (2).Spread on pottery mouth (1) cylindrical to suppress behind the high-temperature plastic (3) and fill in the metal shell (2), treat that high-temperature plastic (3) solidifies after, become the whole compound of a cermet.

Because ceramic mouth (1) is filled in by powerful pressure and is gone in the metal shell (2), therefore exists very big compression in the ceramic mouth (1).In use uneven heating, perhaps, accidental bump can produce certain tension somewhere, but,, also often can not make this place reach the degree that dangerous tension occurs and break even so certain tension superposes up as long as original compression is enough powerful.That is to say that the compression that adds in advance makes ceramic mouth (1) greatly reduce because of the danger that tension occurs and destroy.

Fig. 2 is another enforcement structure of such scheme, and different with Fig. 1 is the middle part that ceramic mouth (1) only reaches metal shell (2), not on earth.Ceramic in this case mouth (1) is only born the effect with the insulation of rifle body, directly is not subjected to the electric arc heat intensive.So ceramic mouth (1) is cracky more not.

Fig. 3 is the another kind of structure of aforementioned schemes, different with Fig. 1 is ceramic mouth (1) divides up and down two parts (1A, 1B).Top (1A) effect makes and the insulation of rifle body as Fig. 2, and bottom (1B) is pressed into from nozzle bottom, and protection metal shell (2) is not burnt out by the direct heating of electric arc.Two ones made nozzle damage back replacing convenient about nozzle divided.

For making the nozzle ectonexine that the phenomenon that layering comes off take place in no instance, the inner surface of the outer round surface of ceramic mouth (1) and metal shell (2) can be made the shape of crude uneven even band pitting, thereby increases the bond strength of glue-line.

Compare with the nozzle that original metal is done, be improved with the insulation of rifle body, reduced by the possibility of electrical arc erosion, the reliability of nozzle and welding gun itself is greatly improve therefore.

Claims (3)

1. the nozzle of a gas metal-arc welding usefulness welding gun has a metal shell (2), it is characterized in that there is a ceramic mouth (1) inside; The external diameter of pottery mouth (1) is more bigger than the internal diameter of metal shell (2), spreads on ceramic mouth (1) cylindrical to suppress behind the high-temperature plastic (3) and fills in the metal shell (2).

2. by the said nozzle of claim 1, it is characterized in that ceramic mouth (1) only reaches the middle part of metal shell (2).

3. by the said nozzle of claim 1, it is characterized in that ceramic mouth (1) divide up and down two parts (1A, 1B).

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