KR20100024828A - Preheater - Google Patents

Preheater Download PDF

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Publication number
KR20100024828A
KR20100024828A KR1020080083559A KR20080083559A KR20100024828A KR 20100024828 A KR20100024828 A KR 20100024828A KR 1020080083559 A KR1020080083559 A KR 1020080083559A KR 20080083559 A KR20080083559 A KR 20080083559A KR 20100024828 A KR20100024828 A KR 20100024828A
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KR
South Korea
Prior art keywords
preheating
torch
hollow
combustion gas
connecting pipe
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KR1020080083559A
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Korean (ko)
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KR100985520B1 (en
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유영구
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현대삼호중공업 주식회사
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Priority to KR1020080083559A priority Critical patent/KR100985520B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K5/00—Gas flame welding
    • B23K5/213—Preliminary treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/465—Details, e.g. noise reduction means for torches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/52—Nozzles for torches; for blow-pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

PURPOSE: A preheating torch is provided to reduce the time and cost for preheating by being consistently supplied with a proper amount of oxygen from the air. CONSTITUTION: A preheating torch(100') comprises a connection pipe(110') connected to a gas supply line, and a heating pipe(120) in which a plurality of through holes(121) are formed along the length. The heating pipe is connected to the connection pipe. The connection pipe includes an intake hole(112) which opens the hollow of the pipe so that exterior air flows into the hollow due to the difference between the interior and exterior pressures resulting from exhaust gas flowing along the hollow.

Description

예열 토치{preheater}Preheater torch {preheater}

본 발명은 대상물의 용접을 진행하기 전 예열을 위해 대상물을 가열하는 예열 토치에 관한 것이다.The present invention relates to a preheating torch for heating an object for preheating before proceeding with welding of the object.

스틸 재질의 대상물 간 용접을 위해서는 대상물에 대한 예열이 요구된다. Pre-heating of the objects is required for welding between steel objects.

일반적으로, 대상물의 일 지점에 열이 집중되는 용접은 용접지점과 비 용접지점의 온도차가 크게 발생하면서 용접효율의 저하 및 균열이 발생할 수 있다. 따라서, 용접을 진행하기 전 용접 대상물을 예열해서, 일 지점에 편중된 가열에 의한 대상물 전체의 온도차를 최소화시키고, 이를 통해 용접효율을 개선하는 것이 바람직하다.In general, a welding in which heat is concentrated at one point of an object may cause a large temperature difference between a welding point and a non-welding point, thereby causing a decrease in welding efficiency and cracking. Therefore, it is preferable to minimize the temperature difference of the entire object due to the heating biased at one point by preheating the welding object before proceeding welding, thereby improving the welding efficiency.

도 1은 종래 예열 토치의 모습을 도시한 사시도인 바, 이를 참조해 설명한다.1 is a perspective view illustrating a conventional preheating torch, which will be described with reference to the drawing.

전술한 바와 같이, 용접을 진행하기 위해서는 대상물의 예열이 요구되고, 대상물의 예열을 위한 가열기구로 예열 토치(100)가 활용된다.As described above, in order to proceed with welding, preheating of the object is required, and the preheating torch 100 is utilized as a heating mechanism for preheating the object.

예열 토치(100)는 대상물의 가열을 위해 화염을 방사할 수 있는 구조를 이루 는데, 가스공급라인(200)으로부터 연소가스를 공급받아 이송하는 연결관(110)과, 연결관(110)과 연통하면서 가능한 넓은 범위로 대상물을 가열하기 위한 가열관(120)으로 이루어진다. 여기서, 가열관(120)은 연결관(110)과 절곡되게 연결되면서 전체적으로 'T' 형상을 이루는 것이 바람직할 것이다.The preheating torch 100 forms a structure capable of radiating a flame for heating an object. The preheating torch 100 communicates with a connection pipe 110 for receiving and transporting combustion gas from a gas supply line 200. While consisting of a heating tube 120 for heating the object to the widest possible range. Here, the heating tube 120 is preferably connected to the connecting pipe 110 to form a 'T' shape as a whole.

한편, 상기 가열관(120)은 연결관(110)을 통해 이송된 연소가스의 배기를 위한 다수의 홀(121)이 형성된다. 즉, 가열관(120)의 모든 홀(121)로부터 배기되는 연소가스가 연소하면 가열관(120)의 길이방향을 따라 화염이 일어나고, 가열관(120)과 마주하는 대상물은 상기 화염에 의해 넓은 면적이 동시에 가열된다.On the other hand, the heating pipe 120 is formed with a plurality of holes 121 for the exhaust of the combustion gas transferred through the connection pipe (110). That is, when the combustion gas exhausted from all the holes 121 of the heating tube 120 is burned, a flame occurs along the longitudinal direction of the heating tube 120, and the object facing the heating tube 120 is widened by the flame. The area is heated at the same time.

일 예로, 38mm 두께 이상의 카본스틸(Carbon Steel) 패널은 용접 전 저온 균열 발생 방지를 목적으로 예열이 선행되어야 하는 대상물의 하나다. 이때, 상기 카본스틸 대상물은 열전도가 상대적으로 낮은 재질이므로, 산소를 사용하지 않고 에틸렌 또는 엘피지 등의 순수 연소가스만을 가열해서 예열한다. 이는 산소와 혼합된 연소가스를 사용하게 되면 높은 온도에 의한 일지점에 대한 급가열로, 대상물은 두께방향으로 고르게 예열되지 못하고 대상물의 표면만 예열되면서, 예열효과가 현저히 저하되기 때문이다.For example, a carbon steel panel having a thickness of 38 mm or more is an object to be preheated to prevent cold cracking before welding. In this case, the carbon steel object is a material having a relatively low thermal conductivity, and thus, only pure combustion gas such as ethylene or lpg is heated and preheated without using oxygen. This is because when the combustion gas mixed with oxygen is rapidly heated to one point due to the high temperature, the object is not preheated evenly in the thickness direction, and only the surface of the object is preheated, so that the preheating effect is significantly lowered.

그러나, 예열효과를 고려해 순수한 연소가스만을 가열할 경우, 대상물의 가열지점에 대한 그을음이 쉽게 발생하고 열 집중성이 감소해서, 대상물의 예열속도가 감소하는 문제가 있었다. 물론, 예열속도의 감소는 상대적으로 연소가스의 사용량을 증가시키므로, 순수한 연소가스만을 가지고 예열작업을 하는 것은 경제적으로도 불리한 것이다.However, when only pure combustion gas is heated in consideration of the preheating effect, soot is easily generated at the heating point of the object and heat concentration decreases, thereby reducing the preheating speed of the object. Of course, the decrease in the preheating rate increases the use of the combustion gas relatively, so it is economically disadvantageous to perform the preheating operation only with pure combustion gas.

한편, 이러한 문제를 해소하기 위해 연소가스에 산소를 혼합해서, 예열 토치(100)의 가열효율을 상대적으로 높일 수 있다. 하지만, 연소가스와 산소를 혼합하면 산소 과잉으로 인해 불꽃이 쉽게 발생할 수 있고, 대상물이 상대적으로 급가열되면서 대상물의 가열지점과 비가열지점에 대한 온도차가 크게 발생할 수 있다. 또한, 두께를 갖는 대상물의 경우엔 두께 방향에 대한 온도차가 커지면서 예열에 의한 혜택을 전혀 기대할 수 없는 문제가 있었다.On the other hand, in order to solve this problem, by mixing oxygen with the combustion gas, the heating efficiency of the preheating torch 100 can be relatively increased. However, when the combustion gas and oxygen are mixed, sparks may easily occur due to excess oxygen, and the object may be relatively rapidly heated, thereby causing a large temperature difference between the heating point and the non-heating point of the object. In addition, in the case of an object having a thickness, there was a problem that the benefits of preheating can not be expected at all as the temperature difference in the thickness direction increases.

따라서, 카본스틸 재질의 대상물을 예열하기 위해서는 예열시간 및 경제적인 불리함에도 불구하고, 산소를 혼합한 연소가스를 이용한 예열은 현재 이루어지지 않고 있고, 결국 대상물의 예열을 위한 적지않은 시간과 비용을 감수해야 하는 문제가 있었다.Therefore, despite the preheating time and economic disadvantage in order to preheat the carbon steel object, preheating using the combustion gas mixed with oxygen is not currently performed, and eventually, it takes a lot of time and money for the preheating of the object. There was a problem.

미 설명한 인출번호 "111"은 가스공급라인(200)과 연결관(110)을 연통가능하게 물리적으로 탈부착하는 "커넥터"이고, "210"은 커넥터(111)에 상응하는 가스공급라인(200)의 "이음구"이다.The drawing number "111", which has not been described, is a "connector" for physically attaching and detaching the gas supply line 200 and the connection pipe 110 so as to be communicable, and "210" indicates a gas supply line 200 corresponding to the connector 111. Is the "joint".

이에 본 발명은 상기와 같은 문제를 해소하기 위해 안출된 것으로, 대상물의 예열효과를 높여서, 예열을 위해 소비되는 시간과 비용을 절약할 수 있도록 하는 예열 토치의 제공을 기술적 과제로 한다.Accordingly, the present invention has been made to solve the above problems, to provide a preheating torch to increase the preheating effect of the object, to save the time and cost consumed for preheating as a technical problem.

상기의 기술적 과제를 달성하기 위하여 본 발명은,The present invention to achieve the above technical problem,

가스공급라인과 연통하는 연결관과, 내외를 관통하는 다수의 홀이 길이방향을 따라 형성되고 연결관과 연통하게 연결되는 가열관을 포함한 예열 토치에 있어서,In the preheating torch including a connecting tube communicating with the gas supply line, and a heating tube in which a plurality of holes penetrating the inside and the outside are formed in a longitudinal direction and connected to the connecting tube,

상기 연결관은 중공을 따라 이동하는 연소가스에 의한 내외 기압 차로 외부 공기가 유입되도록, 중공을 개구한 흡기구가 더 포함된 예열 토치이다.The connecting pipe is a preheating torch further including an inlet opening that opens the hollow so that the outside air is introduced into the pressure difference between the inside and the outside by the combustion gas moving along the hollow.

상기 본 발명은, 발열효과를 높일 수 있는 적정량의 산소를 공기 중에서 일정하게 공급받을 수 있고, 이를 위한 종래 예열시스템의 변경이 전혀 없으므로, 예열을 위한 작업시간의 단축과 비용 절감을 효율적으로 실현할 수 있게 된다.The present invention can be constantly supplied with an appropriate amount of oxygen in the air to increase the heating effect, there is no change in the conventional preheating system for this, it is possible to efficiently realize a reduction in work time and cost savings for preheating Will be.

이하 본 발명을 첨부된 예시도면에 의거하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 예열 토치의 모습을 도시한 사시도인 바, 이를 참조해 설명한다.Figure 2 is a perspective view showing a state of the preheating torch according to the present invention, will be described with reference to this.

본 발명에 따른 예열 토치(100')는 가스공급라인(200)과 연통가능하게 연결되고 일 지점에서 중공을 개구한 흡기구(112)를 갖는 연결관(110')과, 다수의 홀(121)이 형성되고 연결관(110')과 연통하면서 상호 절곡된 형상으로 연결되는 가열관(120)으로 이루어진다.The preheating torch 100 ′ according to the present invention is connected to the gas supply line 200 and has a connection pipe 110 ′ having an inlet 112 open to a hollow at one point, and a plurality of holes 121. It is formed and made of a heating tube 120 connected in a bent shape while communicating with the connection pipe 110 '.

즉, 본 발명에 따른 예열 토치(100')는 연결관(110')에 흡기구(112)가 더 형성되는 것이다. 따라서, 가스공급라인(200)으로부터 이송된 고압의 연소가스는 연결관(110')의 중공을 따라 이동하면서 흡기구(112)를 통과하게 된다.That is, in the preheating torch 100 'according to the present invention, the inlet 112 is further formed in the connection pipe 110'. Therefore, the high pressure combustion gas transferred from the gas supply line 200 passes through the inlet 112 while moving along the hollow of the connection pipe 110 ′.

그런데, 연결관(110')을 따라 이동하는 연소가스는 비교적 높은 기압에 의해 이동하므로, 연결관(110')의 길이방향을 따라 이동하는 연소가스는 흡기구(112)를 통해 배출되지 않고, 오히려 연결관(110') 내외의 기압 차로 인해 외부 공기가 흡기구(112)로 유입된다.However, since the combustion gas moving along the connecting pipe 110 'is moved by a relatively high air pressure, the combustion gas moving along the longitudinal direction of the connecting pipe 110' is not discharged through the inlet 112, rather The outside air flows into the inlet 112 due to the pressure difference inside and outside the connection pipe 110 ′.

이때, 외부 공기에 포함된 산소의 조성은 거의 일정하고, 그 양 또한 적정량을 유지하므로, 대상물의 예열을 위한 혼합 연소가스의 조성이 일정하게 유지됨은 물론 안정된 가열 환경을 이룰 수 있다.At this time, since the composition of oxygen contained in the outside air is almost constant, and the amount is also maintained in an appropriate amount, the composition of the mixed combustion gas for preheating the object can be maintained as well as a stable heating environment.

결국, 본 발명에 따른 예열 토치(100')는 별도의 산소공급 없이도, 공기 중에서 적정량의 산소를 안정적으로 공급받아 대상물의 예열을 위한 최상의 가열환경을 조성할 수 있으므로, 예열작업을 위한 기존 예열시스템의 변화가 요구되지 않고, 예열 토치(100')의 교체만으로 작업시간 절감과 비용절감 모두를 이루게 된다.As a result, the preheating torch 100 ′ according to the present invention can be stably supplied with an appropriate amount of oxygen in the air to create the best heating environment for preheating the object without a separate oxygen supply, and thus, the preheating system for the preheating operation. No change is required, and only the replacement of the preheating torch 100 'achieves both work time and cost reduction.

한편, 본 발명에 따른 예열 토치(100')는 흡기구(112)가 형성된 연결관(110')의 일 지점에 노즐(113)을 형성할 수 있는데, 이에 대한 설명은 도 3을 참 조해 설명한다.Meanwhile, the preheating torch 100 'according to the present invention may form the nozzle 113 at one point of the connection pipe 110' in which the inlet 112 is formed, which will be described with reference to FIG. 3. .

도 3은 도 2의 A-A'선 단면도인 바, 이를 참조해 설명한다.3 is a cross-sectional view taken along line AA ′ of FIG. 2, and will be described with reference to the drawing.

본 발명에 따른 예열 토치(100')의 흡기구(112, 112')는 외부 공기의 흡기효율을 개선하기 위해 서로 마주하도록 절개되어 형성될 수 있고, 연소가스가 배출되는 노즐(113)의 말단은 흡기구(112, 112')의 시작점 부분에 배치되어서, 노즐(113)에 의해 연소가스의 이동속도가 증가하고 이를 통해 흡기구(112, 112') 주변 기압은 낮아지게 된다. 결국, 흡기구(112, 112')의 흡기력은 증가하고, 이를 통해 연소가스와 혼합되는 공기의 양은 증가하게 된다. 물론, 노즐(113)의 배치위치와 구경의 조정으로, 노즐(113)로부터 배기되는 연소가스의 기압을 조정할 수 있으므로, 이에 따른 공기의 흡기량 조정을 통해 혼합 연소가스의 산소비율을 변경할 수도 있을 것이다.The intake openings 112 and 112 'of the preheating torch 100' according to the present invention may be formed to be cut to face each other to improve the intake efficiency of the outside air, and the end of the nozzle 113 through which the combustion gas is discharged may be formed. Since it is disposed at the starting point of the inlet 112, 112 ', the moving speed of the combustion gas is increased by the nozzle 113, and the air pressure around the inlet 112, 112' is lowered. As a result, the intake force of the inlets 112 and 112 'is increased, thereby increasing the amount of air mixed with the combustion gas. Of course, since the air pressure of the combustion gas exhausted from the nozzle 113 can be adjusted by adjusting the arrangement position and the aperture of the nozzle 113, the oxygen ratio of the mixed combustion gas may be changed by adjusting the intake air amount accordingly. .

노즐(113)은 도시한 바와 같이 연결관(110')과 별품일 수 있고, 일체일 수도 있으며, 연결관(110') 내에 삽입되는 별도의 관일 수도 있다. 따라서, 흡기구(112, 112') 근방에서 연소가스의 이동속도를 증가시킬 수 있는 노즐(113)의 구성이 연결관(110)의 중공에 위치한다면, 이하의 청구범위에 기재된 기술적 사상의 범위 내에 있다 할 것이다.The nozzle 113 may be separate from the connecting pipe 110 'as shown, may be integrated, or may be a separate pipe inserted into the connecting pipe 110'. Therefore, if the configuration of the nozzle 113 that can increase the moving speed of the combustion gas in the vicinity of the inlet 112, 112 'is located in the hollow of the connecting pipe 110, it is within the scope of the technical idea described in the claims below. Will do.

이상 설명한 본 발명에 따른 예열 토치(100')를 통해 대상물의 표면에 맺힌 그을음을 약 70% 감소시켰고, 예열 속도를 30% 상승시켰으며, 균일한 산소 흡입으로 인한 급가열의 가능성을 최소화시켰다.Through the preheating torch 100 ′ according to the present invention described above, the soot formed on the surface of the object was reduced by about 70%, the preheating rate was increased by 30%, and the possibility of rapid heating due to uniform oxygen inhalation was minimized.

도 1은 종래 예열 토치의 모습을 도시한 사시도이고,1 is a perspective view showing a state of a conventional preheating torch,

도 2는 본 발명에 따른 예열 토치의 모습을 도시한 사시도이고,2 is a perspective view showing the appearance of the preheating torch according to the present invention;

도 3은 도 2의 A-A'선 단면도이다.3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

- 첨부도면의 주요부분에 대한 용어설명 --Explanation of terms for main parts of attached drawings-

100, 100'; 예열 토치 110, 110'; 연결관100, 100 '; Preheat torch 110, 110 '; Connector

111; 커넥터 112, 112'; 흡기구111; Connectors 112 and 112 '; Intake vent

113; 노즐 120; 가열관113; Nozzle 120; Heating tube

121; 홈 200; 가스공급라인121; Home 200; Gas supply line

Claims (3)

가스공급라인과 연통하는 연결관(110)과, 내외를 관통하는 다수의 홀(121)이 길이방향을 따라 형성되고 연결관(110)과 연통하게 연결되는 가열관(120)을 포함한 예열 토치에 있어서,In the preheating torch including a connecting pipe 110 communicating with the gas supply line, and a plurality of holes 121 passing through the inside and outside of the heating pipe 120 are formed along the length direction and connected to the connecting pipe 110. In 상기 연결관(110)은 중공을 따라 이동하는 연소가스에 의한 내외 기압 차로 외부 공기가 유입되도록, 중공을 개구한 흡기구(112)가 더 포함된 것을 특징으로 하는 예열 토치.The connecting pipe (110) is a preheating torch, characterized in that it further comprises an inlet (112) opening the hollow so that the outside air flows into the internal and external pressure difference by the combustion gas moving along the hollow. 제 1 항에 있어서,The method of claim 1, 상기 흡기구(112)는 둘 이상이 연결관(110)의 둘레를 따라 서로 마주하게 형성 배치된 것을 특징으로 하는 예열 토치.The inlet 112 is preheated torch, characterized in that two or more are formed facing each other along the circumference of the connecting pipe (110). 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2, 상기 흡기구(112)의 기압을 낮추기 위해 연소가스의 이동속도가 증가하도록, 연결관(110)의 중공에 노즐(113)이 배치된 것을 특징으로 하는 예열 토치.Preheating torch, characterized in that the nozzle 113 is disposed in the hollow of the connecting pipe 110 to increase the moving speed of the combustion gas to lower the air pressure of the intake port (112).
KR1020080083559A 2008-08-26 2008-08-26 preheater KR100985520B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101905399A (en) * 2010-08-04 2010-12-08 江苏申港锅炉有限公司 Preheating device used before welding of boiler header pipe joint
CN112372105A (en) * 2020-06-30 2021-02-19 中国二十二冶集团有限公司 Steel structure welding preheating device and construction method thereof
US11131455B2 (en) 2015-08-04 2021-09-28 Warming Trends, Llc System and method for building ornamental flame displays
US12055300B2 (en) 2020-11-24 2024-08-06 Warming Trends, Llc Flame burner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS591922B2 (en) 1979-08-23 1984-01-14 三菱重工業株式会社 line burner
JPS5779114A (en) 1980-11-04 1982-05-18 Kusakabe Kikai Kk Gaseous frame type heater
JPS60141395A (en) 1983-12-28 1985-07-26 Nippon Steel Corp Preheating device for weldment
KR100760363B1 (en) * 2006-11-06 2007-09-20 제이아이산업(주) Pre-heating torch with multi-pipe type for welding work in a shipyard

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101905399A (en) * 2010-08-04 2010-12-08 江苏申港锅炉有限公司 Preheating device used before welding of boiler header pipe joint
US11131455B2 (en) 2015-08-04 2021-09-28 Warming Trends, Llc System and method for building ornamental flame displays
US11193670B2 (en) 2015-08-04 2021-12-07 Warming Trends, Llc System and method for building ornamental flame displays
US11384932B2 (en) 2015-08-04 2022-07-12 Warming Trends, Llc System and method for building ornamental flame displays
US12060992B2 (en) 2015-08-04 2024-08-13 Warming Trends, Llc System and method for building ornamental flame displays
CN112372105A (en) * 2020-06-30 2021-02-19 中国二十二冶集团有限公司 Steel structure welding preheating device and construction method thereof
US12055300B2 (en) 2020-11-24 2024-08-06 Warming Trends, Llc Flame burner

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