Novel weld preheating device

Abstract

The invention discloses a novel weld preheating device. The novel weld preheating device comprises a box and a control cabinet, three flame heaters are arranged on each of the upper inner portion and the lower inner portion of the box, a flashback arrestor is arranged inside every flame heater, clamping grooves are arranged in the middles of two sides of the box and provided with balls, a heat insulation door is mounted on the left side of the box, an observation window is formed in the upper portion of the heat insulation door, a temperature sensor is arranged below the observation window, an oxygen inlet pipe and an acetylene inlet pipe are arranged on the lower portion of the control cabinet and provided with corrosion-resistant high-pressure proportional overflow valves, and a control console is arranged in the middle of the control cabinet. The novel weld preheating device has the advantages that oxygen and acetylene are combined with the flame heaters, so that a preheated plate placed in the box can be preheated sufficiently; by the aid of the corrosion-resistant high-pressure proportional overflow valves, the plate can be heated by flame properties of the oxygen and the acetylene, so that 'loss' of metal elements in the plate during heating is reduced, and economy and practicality are achieved.

Description

technical field [0001] The invention relates to the welding field, in particular to a novel pre-welding preheating device. Background technique [0002] Preheating before welding is an effective means to prevent cold cracks in workpieces during welding, but cold cracks in low-alloy high-strength steel welding is a common and very serious defect, so preheating before welding is required, but existing Some preheating devices use electric heating, and some even use torches to preheat. Although they all achieve the preheating effect, manual torch heating cannot accurately control the preheating temperature at all. It depends entirely on the experience of the operator. Electric heating not only consumes a lot of energy, but also the metal elements are easy to "lose" when the plate is heated. For example, the Chinese patent No. CN 104476030 A has excellent preheating effect, but its structure is complicated, the preheating workpiece is single, and the maintenance cost is high. , ...

AI Technical Summary

Problems solved by technology

[0002] Preheating before welding is an effective means to prevent cold cracks in workpieces during welding, but cold cracks in low-alloy high-strength steel welding is a common and very serious defect, so preheating before welding is required, but existing Some preheating devices use electric heating, and some even use torches for preheating. Although they all achieve the preheating effect, manual torch heating cannot accurately control the preheating temperature at all. It depends entirely on the experience of the operator. Electric heating not only consumes a lot of energy, but also the metal elements are easy to "lose" when the plate is heated. For example, the Chinese patent No. CN 104476030 A has excellent preheating effect, but its structure is complicated, the preheating workpiece is single, and the maintenance cost is high. , the practical effect is not high, so a simple, cheap and effective pre-weld preheating device needs to be developed

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