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A stainless steel tube-sheet welding method with pre-set filler metal

A technology for stainless steel pipes and filler metals, applied in welding equipment, welding accessories, metal processing equipment, etc., can solve the problems of easy crystal cracks, affecting the use effect, and poor welding quality, so as to improve welding quality, optimize processing, and pass rate-boosting effect

Active Publication Date: 2021-11-16
江苏索普赛瑞装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 310S (the domestic brand is 0Cr25Ni20) is a heat-resistant austenitic stainless steel with good high-temperature resistance and is widely used in the sulfuric acid industry. Welding this type of stainless steel is prone to welding hot cracks. Crystal cracks, a type of hot cracks, often appear in In the weld, it is especially prone to appear at the end of the weld and the arc crater. For example, the welding of the tube and the tube plate in the boiler vessel is welded with 310S as the base material. After actual verification, the welding is very prone to crystallization cracks, which will lead to poor welding quality. Especially poor, therefore, affecting the effect of future use

Method used

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  • A stainless steel tube-sheet welding method with pre-set filler metal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Stainless steel tube pre-filled metal plate welding method of the present embodiment, comprising the steps of:

[0026] A, pretreatment tube plate:

[0027] Surface finish welding the tube sheet with an annular groove, the annular groove along the pre-groove in the ring wire cloth at the root and groove;

[0028] B, the welding step:

[0029] Using a welding material ER310, Φ0.9, standard SFA-5.9, tungsten arc welding processes in two tubesheet for welding, the welding position is optionally 5G counterclockwise direction (horizontal tube axis), the welding process of selected welding current, wire feed speed selection and control of the wire feed;

[0030] a, select the welding current: 134A welding current is the first step of welding, using a welding current is 136A second step of welding, the welding process between the two channel temperature ≤100 ℃;

[0031] b, wire feed speed selection: during a first welding wire feed speed selection procedure selected wire feed spee...

Embodiment 2

[0035] Stainless steel tube pre-filled metal plate welding method of the present embodiment, comprising the steps of:

[0036] A, pretreatment tube plate:

[0037] Surface finish welding the tube sheet with an annular groove, the annular groove along the pre-groove in the ring wire cloth at the root and groove;

[0038] B, the welding step:

[0039] Using a welding material ER310, Φ0.9, standard SFA-5.9, using gas tungsten arc welding (GTAW) procedures in two tubesheet welding (tungsten Φ2.3mm, WC20 tungsten cerium), preheating before welding , the minimum preheating temperature ≥5 ℃, the welding process of the welding current selection, selected wire feed speed of wire feed and control;

[0040] a, the DCEN welding current (DCSP) selection: welding current 130A is the first step of welding, using a welding current is 132A second step of welding, the welding process between the two channel temperature ≤60 ℃;

[0041] b, wire feed speed selection: during a first welding wire feed s...

Embodiment 3

[0045] Stainless steel tube pre-filled metal plate welding method of the present embodiment, comprising the steps of:

[0046] A, pretreatment tube plate:

[0047] Surface finish welding the tube plate with an annular groove, in the pre-groove in the annular groove and in the wire cloth ring groove root, using ER310 Φ0.9 welding wire, wherein the step of using a special extruder, the extruder, including the ability to set in the wall of the tube and the sleeve conical surface, the conical surface of the sleeve having an end portion provided with an annular peripheral groove cooperating taper, in fact, the tapered conical surface slightly less than the taper of the annular groove, the material of the sleeve is round 31008 material obtained by the practice, the tapered conical surface is 30-35 °, when the slope angle of the annular groove is 40 °, the taper preferably after of 30 °, the welding wire is filled in the annular groove through the sleeve having a conical surface compacte...

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Abstract

The invention discloses a welding method of a stainless steel tube plate with filler metal preset. It includes the following steps: A. Processing the welding surface of the tube sheet with an annular groove, and presetting the metal along the annular groove and at the root of the groove in the groove; Two processes are used to weld the tube sheet, during the welding process, the selection of the welding current, the selection of the wire feeding speed and the control of the wire feeding process are carried out. The advantages are: the arc crater is optimized during the welding process and a reasonable finishing process is adopted, which effectively avoids the problem of weld cracking and greatly improves the welding quality. Welding wire, using a special wire extruder to extrude the wire to the root of the groove, and then cooperate with the new process to solve the problem of root welding cracks and incomplete penetration, so that the pass rate of root penetration has been greatly improved promote.

Description

Technical field [0001] The present invention relates to a method of welding 310S stainless steel, particularly stainless steel tube plate welding method of pre-filled metal. Background technique [0002] 310S (internal designation 0Cr25Ni20) belonging to the heat-resistant austenitic stainless steel with good high temperature properties, is widely used in the sulfuric acid industry, this type of welding stainless steel welded prone to hot cracking, thermal cracking one crystal cracking often occurs in weld, in particular likely to occur in the weld portion and ending at the crater occurs, such as a boiler vessel welded tube and tube plate 310S as the base material is welded, field-proven, which is prone to weld solidification cracking, resulting in weld quality particularly poor, therefore, affect the future results. Inventive content [0003] To be solved by the present invention is to provide a technique capable of reducing the problem of cracking, improved pre-filled metal so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/133B23K9/32
CPCB23K9/133B23K9/167B23K9/32
Inventor 刘中亚陈伟金严伟明周波高军
Owner 江苏索普赛瑞装备制造有限公司