Internal/ external multi-protection narrow gap/ super-narrow gas welding nozzle

Abstract

The invention relates to an internal / external multi-protection narrow gap / super-narrow gas welding nozzle which comprises a nozzle body with three gas inlet through holes, wherein one gas inlet through hole serves as a primary shielding gas channel, and the other two gas inlet through holes serve as secondary shielding gas channels parallel to the primary shielding gas channel in height. The internal / external multi-protection narrow gap / super-narrow gas welding nozzle further comprises pressure reduction and equalizing cavities and flow uniforming sieves, and the lower portions of the flow uniforming sieves are communicated with open gas outlet channels of a primary shielding gas area, a left secondary shielding gas area and a right secondary shielding gas area. The internal / external multi-protection narrow gap / super-narrow gas welding nozzle has the advantages that primary protection and secondary protection of filling welding passes in joints, sub-cosmetic welding passes and cosmetic welding passes can be met, protection welding of primary shielding gas and secondary shielding gas of the same gas and different gases can be met, bidirectional and unilateral backward pulling gas protection is achieved, and gas consumption is greatly reduced while welding quality is improved; the internal / external multi-protection narrow gap / super-narrow gas welding nozzle is made of ceramic materials, so that the internal / external multi-protection narrow gap / super-narrow gas welding nozzle is reliable in high-temperature insulation performance and long in service life.

Description

technical field [0001] The invention relates to an internal / external multiple protection narrow gap / ultra-narrow gap welding nozzle, which is internally / externally equipped with primary gas protection in the liquid molten pool area and two-way trailing gas protection in the high-temperature weld area, that is, the secondary protection function The invention relates to narrow gap and ultra-narrow gap mixed gas shielded welding and inert gas shielded welding nozzle, belonging to the field of welding technology. Background technique [0002] Narrow gap / ultra-narrow gap mixed gas shielded welding and inert gas shielded welding (NG / UNG-MAG / MIG), also known as narrow gap / ultra-narrow gap MAG / MIG welding, this welding technology has high deposition speed, welding The metallurgical process does not have the interaction between the slag phase and the liquid phase metal, so it is more concise, the probability of slag inclusion defects is almost zero, the welding heat input is lower, t...

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Problems solved by technology

Most of the above-mentioned prior art is a single-function built-in type (that is, the nozzle can extend into the inside of the groove), among which, the prior art 2 is an external type (the nozzle does not extend into the inside of the groove, but works outside the groove); The built-in nozzle can solve the metallurgical protection of the liquid molten pool area of ​​the filling bead (that is, the primary protection), but it is difficult to reliably solve the metallurgical protection of the cover weld bead and the secondary cover weld bead; the ideal design state of the external nozzle can solve the filling at the same time The primary protection and secondary protection of the weld bead and the sub-covering weld bead, however, the protection effect of the deep filling weld bead of the extra-thick plate and super-thick plate is poor, and the second is that the gas consumption is particularly large, which is very unfavorable for welding production Cost reduction; the prior art fails to solve the problem of different kinds of gases for the primary shielding gas and the secondary shielding gas, and the problem of the two-way and one-sided dragging of the secondary shielding gas (that is, only the left dragging protection when welding in the right direction, Only the right back drag protection when welding to the left)

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