Gas for soldering or cutting metals and its preparing method

Abstract

A welding-cutting gas for metals is prepared from the liquefied propylene, liquefied propane, their mixture, or the mixture of liquefied propene and natural gas, and an additive prepared from ethanediol methylether (40-60 wt.%), polyoxyvinylether surfactant composition (5-15%), heterol oil (15-25%), the solution of ferrocene in methanol (8-15%) and the solution of diphenylamine in methanol (5-12%). Its advantages are low energy consumption, no environmental pollution, high welding quality and speed, and underwater cutting.

Description

Technical field [0001] The invention relates to a gas used for welding and cutting of metal materials, belonging to the field of C10L1 / 12 manufacturing. Background technique [0002] The gas used for welding and cutting metals has always been acetylene gas. The cost of acetylene gas is high, and it is prone to explosion accidents. It is easy to blast and temper during use and cannot be used for underwater cutting. Contains toxic gases such as phosphine and hydrogen sulfide, which endanger human health and pollute the environment. The cylinders are heavy and inconvenient to carry. [0003] In view of the shortcomings of acetylene welding and cutting gas, some scientific and technological workers are looking for fuels to replace acetylene gas. Chinese patent CN1057110 discloses a method for preparing metal cutting gas using liquefied petroleum gas as fuel and alkaline aqueous solution of persulfate or hydrogen peroxide and potassium permanganate as additives. This patent improves t...

AI Technical Summary

Problems solved by technology

[0004] 1. When the temperature of liquefied petroleum gas is low in winter, it cannot be completely gasified, and it needs to be heated to completely gasify

[0005] 2. The welding quality has not reached the level of acetylene gas, so it cannot be completely replaced

The persulfate, hydrogen peroxide, and potassium permanganate used decompose quickly in alkaline aqueous solution, and the decomposition is complete within a few hours or a few days, without long-term effect

[0006] 3. The oxygen produced by the decomposition of the above-mentioned strong oxidant is mixed with liquefied petroleum gas, which is very easy to explode and poses a safety hazard

[0007] 4. The alkaline aqueous solution of the strong oxidizing agent used in this patent is immiscible with liquefied petroleum gas. The former is a strong polar substance, while the latter is a non-polar substance. The polarity is very different and cannot be uniformly miscible. It is liquefied petroleum gas, the lower layer is an aqueous solution of oxidant, and the role of additives is difficult to play

[0008] Because the oxidant deposits on the bottom of the steel cylinder, it causes corrosion to the steel cylinder and shortens the service life of the steel cylinder

There are no relevant reports about liquefied propylene, liquefied propane, and natural gas being used as metal welding and cutting gas