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Welding method for controlling hardness of weld seam heat-affected zone of low-carbon steel material for casting

A heat-affected zone and welding method technology, applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve problems such as not overcome

Inactive Publication Date: 2012-07-04
KOCEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the maximum hardness of the heat-affected zone of the weld, and the hardness difference between the base metal and the weld metal are required to be less than 40HB. This is the difficulty of this technology, and there is no way to overcome this difficulty at present.

Method used

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  • Welding method for controlling hardness of weld seam heat-affected zone of low-carbon steel material for casting
  • Welding method for controlling hardness of weld seam heat-affected zone of low-carbon steel material for casting

Examples

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Embodiment 1

[0019] Example 1: A welding method for controlling the hardness of the heat-affected zone of a low-carbon steel weld for casting. The method uses φ4mm and φ5mm AWS 5.1 E7015 electrodes, the minimum preheating temperature is 170°C, the welding current is 175A-240A, and the voltage 20-30V, welding speed 10-25cm / min, welding heat input of 23-27KJ / cm, and tempering weld bead.

Embodiment 2

[0020] Embodiment 2: A welding method for controlling the hardness of the heat-affected zone of a low-carbon steel weld seam for casting. The method uses φ4mm and φ5mm AWS 5.1 E7015 grade electrodes, the minimum preheating temperature is 200°C, the welding current is 175A-240A, and the voltage 20-30V, welding speed 10-25cm / min, welding heat input of 20-25KJ / cm, and tempering weld bead.

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Abstract

The invention relates to a welding method for controlling hardness of a weld seam heat-affected zone, in particular to a welding method for controlling hardness of weld seam heat-affected zone of a low-carbon steel material for casting. The method is characterized in that the method adopts welding rods of AWS5.1 E7015 with a diameter of 4mm and 5mm, and adopts a temper bead to realize welding under the following conditions: lowest preheating temperature, welding current 175 to 240A, voltage 20 to 30V, and welding speed 10 to 25cm / min. The method provided by the invention is unique, and can control the hardness of a casting body between 160 and 170HB by regulating the chemical components and heat treatment process of a casting. If the hardness of the weld seam heat-affected zone is controlled below 200HB, the hardness difference among the weld seam heat-affected zone, a base material and a weld seam metal can be reduced, and the hardness difference of the weld seam part can be controlled below 40HB.

Description

technical field [0001] The invention relates to a welding method for controlling the hardness of the heat-affected zone of a weld, in particular to a welding method for controlling the hardness of the heat-affected zone of a low-carbon steel weld for casting. Background technique [0002] The current international standard ISO15614-1: 2004 Metal Material Welding Procedure and Evaluation 7.4.6 stipulates the maximum hardness value of the welding area of ​​carbon steel: the maximum hardness in the welding state is about 375HB, and the maximum hardness after heat treatment is about 315HB. Actually, the hardness value of castings produced according to ASTM A27 70-40 material standard is 140-175HB, and AWS 5.1 E7015 grade electrode is selected. After welding according to the recommended process parameters, the hardness of the heat-affected zone of the weld is between 200-240HB. Table 1. The performance requirements of customers for castings made of ASTM A27 70-40. Among them, th...

Claims

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Application Information

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IPC IPC(8): B23K9/02B23K9/23B23K9/235
Inventor 曹鹏罗永建彭凡季文山
Owner KOCEL GROUP
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