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Narrow-gap all position pusle automatic argon arc welding technique for dissimillar nicklel-based alloys

A technology of nickel-based alloys and dissimilar metals, applied in metal processing equipment, arc welding equipment, welding media, etc., can solve the problems of unstable welding quality, difficult control of dilution rate, and large consumption of welding materials, and achieve stable welding quality, Improved welding efficiency and low consumption of welding consumables

Active Publication Date: 2007-04-18
SHANGHAI BOILER WORKS
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AI Technical Summary

Problems solved by technology

There are two main types of dissimilar metal joint structures, one is a single-sided U-shaped or double-sided U-shaped conventional groove with a thickness of 6-30mm nickel-based alloy isolation layer, and the width of the groove is 12-30mm. Wide, the nickel-based alloy isolation layer is thicker, for the conventional groove joint with isolation layer, the welding efficiency is low, and the welding material consumption is large; the other is the narrow gap joint without isolation layer, for the joint without isolation layer For narrow-gap groove joints, preheating is required before welding, and the interlayer temperature must be kept above 120°C during welding, the dilution rate is difficult to control, and the welding quality is unstable

Method used

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  • Narrow-gap all position pusle automatic argon arc welding technique for dissimillar nicklel-based alloys
  • Narrow-gap all position pusle automatic argon arc welding technique for dissimillar nicklel-based alloys

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Embodiment

[0030] Stainless steel pipe 5 size: outer diameter 900mm, inner diameter 676mm; low-alloy steel pipe 6: inner wall including 6mm / end inner wall local 12mm thick stainless steel surfacing layer, size: outer diameter 900mm, inner diameter ≤ 676mm;

[0031] As shown in Figure 1, it is a schematic diagram of all-position welding of dissimilar nickel-based alloys with narrow gaps. The GT-VI narrow gap welding equipment manufactured by LIBURDI Company is used, including F-type heads and special gas hoods with double protection effects.

[0032] Its method is:

[0033] Step 1: surfacing 309L / 308L stainless steel surfacing layer 8 in the low alloy steel pipe 6 by means of hot wire pulse tungsten argon arc welding, with a thickness of 6 mm, in the end near the nickel-based alloy isolation layer 7 surfacing welding Surfacing three layers of 308L stainless steel within the range of 30mm, so that the thickness of the whole stainless steel surfacing layer that is locally piled up is 6mm, ...

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Abstract

An automatic pulse argon arc welding technology for the butt connection between different two tubes by using Ni-base alloy as isolating layer includes such steps as build-up welding at least three layers of stainless steel in low-alloy steel tube, build-up welding an isolating Ni-base alloy layer, machining the bevels of isolating Ni-base alloy layer and stainless steel tube, butt locating, and TIG welding.

Description

technical field [0001] The invention relates to a narrow-gap all-position pulse automatic argon arc welding process for dissimilar metal nickel-based alloys, in particular to a hot-wire argon-arc welding process for a large-diameter thick-walled tube INCONEL 690 nickel-based alloy isolation layer of low alloy steel and austenitic stainless steel The invention relates to a surfacing welding and a narrow-gap all-position pulse automatic argon arc welding process, which belongs to the field of welding technology. Background technique [0002] Welding of dissimilar metal nickel-based alloys is a difficult point in the field of welding, especially in the main equipment of the nuclear island to take over the safety end Mn-Ni-Mo low alloy steel and austenitic stainless steel dissimilar metal INCONEL 690 nickel-based alloy or INCONEL 600 nickel-based alloy material Welding, due to special materials and high technical requirements, makes welding difficult. There are two main types o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/095B23K9/235B23K9/23B23K33/00B23K35/38C21D9/50C21D1/30
Inventor 张茂龙
Owner SHANGHAI BOILER WORKS
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