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MIG/MAG welding of steel to carbon with rotary arc and gaseous mixture of Ar/He/O2

A technology of mixed gas and shielding gas, which is applied in the direction of arc welding equipment, welding equipment, welding medium, etc., and can solve problems such as difficulty

Inactive Publication Date: 2013-03-20
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, from an industrial point of view, it is not easy to obtain a good weld bead appearance

Method used

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  • MIG/MAG welding of steel to carbon with rotary arc and gaseous mixture of Ar/He/O2
  • MIG/MAG welding of steel to carbon with rotary arc and gaseous mixture of Ar/He/O2
  • MIG/MAG welding of steel to carbon with rotary arc and gaseous mixture of Ar/He/O2

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Embodiment Construction

[0047] Generally, in MIG-MAG arc welding, there are three main or traditional droplet transfer states, namely:

[0048] - Short transition. This droplet transfer regime is obtained for low arc energies (typically current from 50A to 200A and voltage from 15V to 20V). A drop of molten metal forms at the end of the filler wire and grows larger until it comes into contact with the pool of molten metal - which contact causes a short circuit. The current is then increased rapidly so that the droplet necks - this causes the droplet to detach and re-ignite the arc. This phenomenon repeats at a frequency of about 50Hz to 200Hz. This state is considered "cold" and has a short arc. This droplet transfer regime is suitable for welding of small thicknesses (ie thicknesses less than 3 mm) and enables control of the molten pool during tack welding.

[0049] - Axial jet. For high welding energies (that is, voltages of at least 28 V for 280 A and higher than a specified current density (...

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Abstract

The invention relates to a ternary gaseous mixture formed from argon, helium and oxygen, characterised in that it is formed from between 19.5 and 20.5 % of helium, between 2.7 and 3.3 % of O2, and argon for the remainder (volume %), and to the use thereof as gaseous protection in a method of electric arc welding of at least one steel part to carbon, using a fusible filler wire. Preferably, the welded parts overlap or cover each other and the rotary arc welding takes place where the parts overlap.

Description

technical field [0001] The present invention relates to the application of a ternary mixed gas as a shielding gas in an arc welding process with a rotating arc, especially in a metal inert gas shielded welding / a metal active gas shielded welding process (MIG / MAG welding process), wherein the ternary mixed gas Consisting of argon, helium and oxygen, consumable wires are used for welding carbon steel components, especially carbon steel components in lap-type configurations, especially meshing lap joints. Background technique [0002] Joints of metal parts in a lap-type configuration (indicated by the term "lap joint") can be seen especially in the constituent parts of pressure vessels of the following types: hot water tanks, fire extinguishers, compressors, refrigeration equipment, LPG cylinders Wait. [0003] In particular, the most widely used joints are those considered to have engaging edges, often called engaging lap joints. Such as image 3 As shown, such joints genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K9/028B23K9/08B23K35/38
CPCB23K9/028B23K2203/04B23K9/0216B23K9/08B23K2201/12B23K35/383B23K9/173B23K2101/12B23K2103/04B23K2103/05
Inventor L·比斯库普G·布戴J-P·普朗卡尔特M·塞兹
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE