Low-temperature submerged-arc automatic welding method for Q370qE steel

A technology of submerged arc automatic welding and low temperature welding, which is applied in welding equipment, welding accessories, arc welding equipment, etc.

Inactive Publication Date: 2012-08-15
WUHAN BRIDGE HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, during automatic submerged arc welding of bridge steel structures, there is no corresponding method or measure to

Method used

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  • Low-temperature submerged-arc automatic welding method for Q370qE steel
  • Low-temperature submerged-arc automatic welding method for Q370qE steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0022] Under the working environment with a temperature of 0°C, automatic submerged arc welding of Q370qE steel is carried out.

[0023] Precisely cut the groove of the welding workpiece with flame, the depth of the groove of the welding workpiece is 14mm, assemble the welding workpiece to form the groove to be welded; dry the welding material according to the requirements, the drying temperature is 300 ° C, the drying time is 2 hours, and the incubator The storage temperature is 100°C; dehumidify and preheat the welding platform, the preheating temperature is 100°C; preheat the welding workpiece with a baking gun, the preheating temperature is 80°C, the preheating range is 100mm on both sides of the groove, using E5015 (diameter 4.0mm) welding rod for positioning welding, using solid core welding wire ER50-3 (diameter 1.2mm), argon-rich mixed gas shielded welding, for bottom welding; using solid core welding wire H10Mn2 (diameter 5.0mm) with flux SJ101 for burying Arc automat...

Embodiment example 2

[0027] The submerged arc automatic welding of Q370qE steel is carried out under the working environment with a temperature of -15°C.

[0028] Precisely cut the groove of the welding workpiece with flame, the depth of the welding groove is 36mm, assemble the welding workpiece to form the groove to be welded; dry the welding material according to the requirements, the drying temperature is 350°C, the drying time is 2 hours, and the storage temperature is 150°C ;Dehumidify and preheat the welding platform, the preheating temperature is 120°C; evenly spread asbestos on the welding platform, that is, the bottom side of the welding workpiece groove; preheat the welding workpiece with a baking gun, the preheating temperature is 120°C, and the preheating range is Groove and both sides 150mm, use E5015 (diameter 4.0mm) electrode for tack welding, use solid core wire ER50-3 (diameter 1.2mm), use argon-rich mixed gas shielded welding for bottom welding, use solid core wire H10Mn2 (diamete...

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Abstract

The invention discloses a low-temperature submerged-arc automatic welding method for Q370qE steel and belongs to the field of welding methods. In the low-temperature submerged-arc automatic welding method, the temperature condition during the whole welding process of the Q370qE steel at environment temperature of 0-minus 15 DEG C is controlled by the steps as follows: dehumidification and pre-heating of a parent metal before welding, drying and temperature keeping of a welding rod and welding flux, and temperature keeping and slow cooling on the welding zone after welding. Especially, during welding, a crawler-type ceramic electric heater which needs electrifying before heating is laid on and covers a welding joint and 100-150mm parts at two sides of the welding joint, so that the temperature of welding joint layers and passes is controlled to 160-200 DEG C, and the crawler-type ceramic electric heater can be adjusted manually to control temperature, so that the temperature among the welding joint layers and passes can be simply and conveniently controlled. After the whole welding process is subjected to such-ordered temperature control, the welding process can be prevented from being influenced by low temperature environment as much as possible; the cooling speed of the welding joint during the welding process is slowed, so that the cold cracking, hardness and brittleness possibilities of the welding joint are reduced; and the low-temperature impact toughness of the submerged-arc automatic welding joint of the Q370qE steel is effectively ensured, the impact dynamic load performance of a bridge steel structure is enhanced and the service life of a bridge is prolonged.

Description

technical field [0001] The invention discloses a low-temperature welding method for automatic submerged arc welding of Q370qE steel, which belongs to the field of welding methods. Background technique [0002] According to the requirements of the current low-temperature welding specification for welding materials, the minimum ambient temperature allowed for Q370qE steel is 0°C. No matter in the north or the south, the temperature is often lower than 0°C in winter, and even reaches -15°C in the north. [0003] The bridge steel structure generally bears the impact dynamic load of the vehicle operation, so there is a high requirement for the low temperature impact toughness of the Q370qE steel welded joints constituting the bridge. Submerged arc automatic welding is one of the most commonly used welding methods in the manufacture of bridge steel structures. When welding in a low temperature environment, the cooling rate of the welded joint is accelerated, which is prone to pro...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/16B23K9/235B23K9/32
Inventor 毛孝发吴元良祝岚冯俊莲刘钊向俊骆强江寅李曼黄鑫
Owner WUHAN BRIDGE HEAVY INDS GROUP
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