Automatic submerged arc welding method for pearlitic heat-resistant steel composite board

A technology for pearlitic heat-resistant steel and submerged arc automatic welding, which is applied to welding equipment, arc welding equipment, welding/welding/cutting items, etc., and can solve the problems of fast weld cooling, weld strength drop, and fast welding speed, etc. problems, to achieve the effect of reducing welding stress, reducing welding consumable filling, and ensuring welding quality

Active Publication Date: 2016-06-15
LUXI IND EQUIP
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  • Abstract
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  • Application Information

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Problems solved by technology

However, automatic submerged arc welding is theoretically not suitable for pearlitic heat-resistant steel, especially thicker pearlitic heat-resistant steel because of its fast welding speed and fast weld seam cooling speed, because the heat-resistant steel cools too quickly Causes the strength of the weld to decrease and is prone to cracks

Method used

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  • Automatic submerged arc welding method for pearlitic heat-resistant steel composite board
  • Automatic submerged arc welding method for pearlitic heat-resistant steel composite board
  • Automatic submerged arc welding method for pearlitic heat-resistant steel composite board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A material is 15CrMoR+S30408, the specification is Φ2800×(80+4) pearlitic heat-resistant steel composite stainless steel plate automatic welding welding method is as follows:

[0044] 1. The double U-shaped groove is adopted. First, the inner groove is processed by mechanical processing method. The angle of the groove is 8° on one side, the groove depth is 50mm, and the root R8 has a smooth transition. The processing form is as follows figure 1 shown.

[0045] 2. Clean up the oil, rust and other impurities within 150mm of the weld groove and both sides of the groove; after cleaning, preheat the weld groove and 200mm of both sides of the groove, and the preheating temperature is 150 ~ 200 ℃ .

[0046] 3. Weld the inner base layer, and perform the base layer priming (1) and the base layer filling (2) in sequence. Please refer to Table 1 for welding parameters, and see the joint form. figure 2 .

[0047] Further, the welding of the base layer is 1.5 mm lower than the b...

Embodiment 2

[0059] One material is 12Cr2Mo1+S30403 and the specification is Φ2000×(60+5) pearlitic heat-resistant steel clad stainless steel plate welding:

[0060] 1. The double U-shaped groove is adopted, and the inner groove is processed by mechanical processing method. The single edge angle of the groove is 8°, the groove depth is 40mm, and the root R8 has a smooth transition. The processing form is as follows figure 1 shown.

[0061] 2. Clean the weld groove and impurities such as oil and rust within 150mm on both sides of the groove; after cleaning, preheat the weld groove and 200mm on both sides of the groove, and the preheating temperature is 200 ~ 250 ℃ .

[0062] 3. Weld the inner base layer, and perform the base layer priming (1) and the base layer filling (2) in sequence. Please refer to Table 2 for welding parameters and joint forms. figure 2 ;

[0063] Further, the welding of the base layer is 2.5 mm lower than the boundary line between the cladding layer and the base la...

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Abstract

The invention discloses an automatic submerged arc welding method for a pearlitic heat-resistant steel composite board. The significant advantages are achieved by changing the welding method and the groove type and adjusting the welding sequence. The automatic submerged arc welding method has the significant advantages that by optimizing the groove type, the welding material filling quantity is reduced, and the welding efficiency is improved; a mechanical mode is adopted to conduct groove machining and welding seam back chipping, parent metal hardening caused by rapid heating and rapid cooling of thermal cutting or carbon arc air gouging is effectively avoided, and the rolling machining and welding quality of a barrel is improved; outer edge back chipping is conducted immediately after inner edge base layer welding is completed, welding stagnation and reheating in the middle can be effectively avoided, and the welding quality is guaranteed; transition layer welding is conducted immediately after base layer welding is completed, composited layer welding is conducted after crack detection is qualified, repeated preheating and transition layer welding which are conducted after nondestructive detection of previous base layer welding is completed and qualified can be effectively avoided, and the composited layer welding quality is improved.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a submerged arc automatic welding method for stainless steel composite plates whose base material is pearlite heat-resistant steel and whose thickness is greater than 60 mm. Background technique [0002] In recent years, with the development of my country's manufacturing technology, the application of heat-resistant steel such as pearlite heat-resistant steel has become more and more extensive, such as furnace parts, heat exchangers, steam turbine rotors, boiler superheaters, etc. However, due to the brittle and hard tendency of pearlitic heat-resistant steel itself, under the cooling rate determined by various fusion welding thermal cycles, microstructures sensitive to cold cracking may be formed in the heat-affected zone of the welded metal box; Most of the heat-resistant steels contain strong carbide forming elements such as Cr, Mo, V, Nb, etc., so that the overheat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235
CPCB23K9/18B23K9/235B23K2103/04
Inventor 黄孝鹏梁兆鹏陈景利邹伟周忠文刘素云
Owner LUXI IND EQUIP
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