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1. 发明专利

JP2006249521A Zinc alloy plated steel with excellent weldability 有权
标题翻译：具有优异焊接性能的ZINC合金钢
公开(公告)号：JP2006249521A
公开(公告)日：2006-09-21
申请号：JP2005069182
申请日：2005-03-11
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KODAMA SHINJI , HAMAYA HIDEKI , MIZUHASHI NOBUO , MIYASAKA AKIHIRO , HARA TAKUYA , NISHIMURA KAZUMI , ASAI KENICHI , TAKAHASHI AKIRA
IPC分类号： C22C38/00 , C22C18/00 , C22C18/04 , C22C38/14 , C23C2/06
摘要： PROBLEM TO BE SOLVED: To provide a zinc alloy plated steel having excellent weldability with which, when welding the zinc alloy plated steel having a tensile strength of base material not lower than 490 MPa class strength level and a thickness of 0.8 to 9 mm by various methods, liquid-metal embrittlement cracking occurring due to zinc alloy plating particularly in a weld heat-affected zone can be stably suppressed and high reliability welded joints can be obtained.
SOLUTION: The zinc alloy plated steel material with excellent weldability is a zinc alloy plated steel material having a zinc alloy plating layer on its surface and being characterized in that it contains, by mass, 0.01 to 0.3% C, 0.01 to 2.0% Si, 0.1 to 3.0% Mn, ≤0.015% S, 0.001 to 0.5% Al, 0.0005 to 0.006% N and further 0.01 to 0.60%, in total, of one or more elements among Nb, V and Zr; an E value as a sensitivity index of liquid-metal embrittlement represented by the following equation exceeds 0.24; and B content ranges from 3 ppm to -102×E+61 ppm: E value = [%C]+[%Si]/17+[%Mn]/7.5+[%Ni]/17+[%Nb]/2+[%V]/1.5+[%Zr]/2 (wherein, E value is the sensitivity index of liquid-metal embrittlement, and [%C], [%Si]... are each content by mass% of respective elements).
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种焊接性优异的锌合金电镀钢，当将基材抗拉强度不低于490MPa等级强度水平和0.8至9的厚度的锌合金电镀钢焊接时通过各种方法，可以稳定地抑制由于锌合金电镀而特别是在焊接热影响区域中发生的液态金属脆化裂纹，并且可以获得高可靠性的焊接接头。解决方案：具有优异焊接性的锌合金镀覆钢材是其表面具有锌合金镀层的锌合金电镀钢材料，其特征在于其含量为0.01至0.3％C，0.01至2.0 Nb，V和Zr中的一种或多种元素的总和为0.1％，Si：0.1〜3.0％，≤0.015％S，0.001〜0.5％Al，0.0005〜0.006％N，进一步0.01〜0.60％由下式表示的作为液体 - 金属脆化的灵敏度指数的E值超过0.24; 并且B含量范围为3ppm至-102×E + 61ppm：E值= [％C] + [％Si] / 17 + [％Mn] /7.5 + [％Ni] / 17 + [％Nb] 2 + [％V] /1.5 + [％Zr] / 2（其中E值为液态金属脆化的灵敏度指数，[％C]，[％Si] 各元素）。版权所有（C）2006，JPO＆NCIPI

2. 发明专利

JP2006035293A Welding method of galvanized steel plate having excellent corrosion resistance and zinc embrittlement cracking resistance of weld 有权
标题翻译：具有优异耐腐蚀性和耐腐蚀性的钢化板的焊接方法焊接开裂电阻
公开(公告)号：JP2006035293A
公开(公告)日：2006-02-09
申请号：JP2004222256
申请日：2004-07-29
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KODAMA SHINJI , HAMAYA HIDEKI , MIZUHASHI NOBUO , ASAI KENICHI , NISHIMURA KAZUMI
IPC分类号： B23K9/23 , B23K35/30
摘要： PROBLEM TO BE SOLVED: To provide an arc welding method of zinc-based alloy plated steel plate capable of obtaining a weld having excellent corrosion resistance and liquid metal embrittlement cracking resistance by suppressing the liquid metal embrittlment cracking of a weld, in particular, a weld metal of stainless steel based component when performing the arc welding of the zinc-based alloy plated steel plate by using a stainless steel-based welding wire.
SOLUTION: In the arc welding method of zinc alloy plated steel plate having excellent corrosion resistance and liquid metal embrittlement cracking resistance of a weld, a weld metal containing a ferritic phase of ≥25% in terms of area ratio and having the tensile strength (TSW) of ≤1.8 in terms of the ratio (TSW/TSB) to the tensile strength (TSB) of a base metal is formed by using a stainless steel welding wire containing for alloy components, by mass to the total mass of the wire, 0.01-0.05% C, 0.1-0.5% Si, 0.5-3% Mn, 7-12% Ni, and 24-30% Cr, while limiting ≤1% Mo and N ≤0.1%.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种能够通过抑制焊接液体金属脆化裂纹获得具有优异的耐腐蚀性和液体金属脆性开裂性的焊接的锌基合金电镀钢板的电弧焊接方法，特别是，通过使用不锈钢基焊丝进行锌基合金镀覆钢板的电弧焊接时的不锈钢基部件的焊接金属。解决方案：在具有优异的耐腐蚀性和焊接液的液态金属脆化抗裂性的锌合金电镀钢板的电弧焊接方法中，含有以面积比计≥25％的铁素体相的焊接金属具有拉伸强度通过使用含有合金成分的不锈钢焊丝，以质量计的总质量来形成贱金属的比例（TSW / TSB）与抗拉强度（TSB）的比值（TSW）≤1.8的强度（TSW）线，0.01-0.05％C，0.1-0.5％Si，0.5-3％Mn，7-12％Ni和24-30％Cr，而限制≤1％Mo和N≤0.1％。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JP2006026691A Method for manufacturing electric resistance welded steel tube excellent in quality of weld zone 有权
标题翻译：焊接质量优良的电阻焊钢管制造方法
公开(公告)号：JP2006026691A
公开(公告)日：2006-02-02
申请号：JP2004209476
申请日：2004-07-16
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAMAYA HIDEKI , FUKAMI SHUNSUKE , MIZUHASHI NOBUO , ISHIZUKA TETSUO , ASAHI HITOSHI , NAKAJI TOMOHIRO , TANIMOTO MICHITOSHI , MANGAYA TETSUYA
IPC分类号： B21C37/08 , B23K13/00 , B23K13/06 , B23K101/06 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an electric resistance welded steel tube excellent in characteristics of a weld zone such as low-temperature toughness, corrosion resistance and cold workability by stably and reliably reducing weld defects attributable to generation of oxides of welds and cold weld defects attributable to local insufficient heat input without changing the set condition when the welding condition is changed.
SOLUTION: When a steel plate is formed in a tubular shape and butted end faces thereof are subjected to the electric resistance welding, inert gas is blown to the butted end faces over the entire range at the temperature of ≥ 650°C on the upstream welding side from at least a weld point under the condition that the butt angle ϕ satisfies the inequalities 0 ≤ ϕ ≤ tan(0.4/d)
-1 , and non-oxidizing high-temperature plasma at a temperature of ≥ 1,400°C is blown in the non-oxidizing atmosphere to the butted end faces over the entire range to the position separate by 1/5 of the power supply distance on the upstream welding side from at least the weld point under the condition that the flow rate is 30-270 m/sec.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种通过稳定可靠地减少由于产生的焊接缺陷而导致的低温韧性，耐腐蚀性和冷加工性等焊接区特性优异的电阻焊钢管的制造方法当焊接条件发生变化时，不会改变设定条件，导致焊接氧化物和冷焊缝缺陷。解决方案：当钢板形成为管状并且其对接端面进行电阻焊时，惰性气体在≥650℃的温度下在整个范围内被吹向对接的端面，在对角φ满足不等式0≤φ≤tan（0.4 / d） -1 的条件下，至少焊接点的上游焊接侧，以及非氧化性高温等离子体在非氧化性气氛中，在非氧化性气氛中的对接端面，至少在上游焊接侧的电源距离的1/5分离至少在条件是流量为30-270m / sec。版权所有（C）2006，JPO＆NCIPI

4. 发明专利

JP2010082697A Method for manufacturing electric resistance welded steel tube excellent in quality of weld zone 有权
标题翻译：焊接质量优良的电阻焊钢管制造方法
公开(公告)号：JP2010082697A
公开(公告)日：2010-04-15
申请号：JP2009202605
申请日：2009-09-02
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAMAYA HIDEKI , MIZUHASHI NOBUO , YAMAMOTO KAZUTO , MIYAGAWA TAKASHI , MIURA TAKAO , TAKEUCHI JUN , WATANABE FUMINORI
IPC分类号： B23K13/00 , B21C37/08 , B23K13/02 , B23K28/02 , H05H1/26
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an electric resistance welded steel tube excellent in quality of a weld zone, a method which uses plasma working gas containing carbon, which can obtain stable plasma discharge over a long period even if carbon is deposited on a cathode surface, and which can suppress deterioration of the cathode. SOLUTION: A cascade type plasma torch 20 is used in which at least a cathode 21 is provided having carbon for the cathode distal end part 21a as a part with a cathode spot formed and in which a cascade 22 is arranged between the cathode 21 and an anode 23. Also, a plasma working gas is used which comprises a mixed gas containing at least CO 2 gas and CH 4 gas and which has a total flow rate, per unit area in the inner diameter D of the anode 23 of the plasma torch 20, with a condition of exceeding 0.2 (lpm/mm 2 ) and less than 0.8 (lpm/mm 2 ). While a plasma jet is jetted toward the butted end faces of the steel plate, electric resistance welding is performed on the butted end faces. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种焊接质量优异的电阻焊钢管的制造方法，其使用含有碳的等离子体工作气体的方法，其能够长期获得稳定的等离子体放电，即使碳沉积在阴极表面上，并且可以抑制阴极的劣化。解决方案：使用级联型等离子体焰炬20，其中至少提供具有用于阴极末端部分21a的碳的阴极21作为形成阴极点的部分，并且其中级联22布置在阴极之间 21和阳极23.此外，使用等离子体工作气体，其包括至少包含CO 2 气体和CH 4 气体的混合气体，并且其具有总流量，等离子体焰炬20的阳极23的内径D中的每单位面积的条件超过0.2（lpm / mm 2），小于0.8（lpm / mm 2））。当等离子体射流朝向钢板的对接端面喷射时，在对接的端面进行电阻焊接。版权所有（C）2010，JPO＆INPIT

5. 发明专利

JP2005230909A ELECTRIC RESISTANCE WELDED STEEL TUBE CONTAINING Cr AND MANUFACTURING METHOD THEREOF 有权
标题翻译：包含Cr的电阻焊钢管及其制造方法
公开(公告)号：JP2005230909A
公开(公告)日：2005-09-02
申请号：JP2004099290
申请日：2004-03-30
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： ISHIZUKA TETSUO , HAMAYA HIDEKI , ASAHI HITOSHI , FUKAMI SHUNSUKE , MIZUHASHI NOBUO
IPC分类号： B21C37/08 , B21C37/083 , C22C38/00 , C22C38/18 , C22C38/50 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide an electric resistance welded tube containing Cr having considerably excellent quality of an electric resistance welded part as compared with conventional quality, and a manufacturing method thereof.
SOLUTION: The total occupied area ratio of inclusions present in a joining interface after the electric resistance welding of an electric resistance welded steel tube containing Cr is ≤0.05%, the occupied area of individual inclusions is ≤0.01 mm
2 , and the number density of the inclusions in the electric resistance welded steel tube containing Cr is ≤0.1 piece/mm
2 . This steel tube can be manufactured by spraying reducing high-temperature combustion flame or reducing plasma at the temperature of ≥1,400°C in a vicinity of a welding point during the electric resistance welding.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种与传统品质相比，含有电阻焊接部件质量极好的Cr的电阻焊管及其制造方法。
解决方案：含有Cr的电阻焊钢管的电阻焊后的接合界面中存在的夹杂物的总占有面积比≤0.05％，各夹杂物的占有面积≤0.01mm 2 ，含有Cr的电阻焊钢管中的夹杂物的数密度为≤0.1个/ mm 2 。该钢管可以通过在电阻焊接期间在焊接点附近在≥1,400℃的温度下喷雾还原高温燃烧火焰或者还原等离子体来制造。版权所有（C）2005，JPO＆NCIPI

6. 发明专利

JP2005028392A Welded joint of galvannealed steel plate 审中-公开
标题翻译：焊接钢筋焊接接头
公开(公告)号：JP2005028392A
公开(公告)日：2005-02-03
申请号：JP2003194417
申请日：2003-07-09
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KODAMA SHINJI , MIYAZAKI YASUNOBU , MIYASAKA AKIHIRO , YAMAOKA IKURO , HAMAYA HIDEKI , MIZUHASHI NOBUO , HARA TAKUYA
IPC分类号： B23K35/30 , C22C38/00 , C22C38/16
摘要： PROBLEM TO BE SOLVED: To provide an excellent welded joint of a galvannealed steel plate capable of suppressing occurrence of zinc embrittlement crack in weld metal when welding the galvannealed steel plate used in a welding structural member.
SOLUTION: In the welded joint of a galvannealed steel plate comprising a steel plate with a zinc alloy plating layer provided on a face side thereof and a welded part, the weld metal to constitute the welded part contains, by mass, 0.01-0.15% C, 0.05-1.5% Si, 0.2-2.0% Mn, ≤ 0.03% P, ≤ 0.015% S, 5-60 ppm B, and 0.002-0.2% Ti while the area ratio of ferrite (pro-eutectoid ferrite) transformed from austenitic grain boundary is ≤ 12%, and the balance Fe with inevitable impurities.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在焊接焊接结构构件中使用的合金化热镀锌钢板时能够抑制焊接金属中的锌脆化裂纹发生的合金化热浸镀锌钢板的优良的焊接接头。解决方案：在包括其表面上设置有锌合金镀层的钢板和焊接部的合金化热镀锌钢板的焊接接头中，构成焊接部的焊接金属质量含有0.01〜 0.15％C，0.05-1.5％Si，0.2-2.0％Mn，≤0.03％P，≤0.015％S，5-60ppm B和0.002-0.2％Ti，而铁素体（共析共析铁素体）从奥氏体晶界转变为≤12％，余量为Fe与不可避免的杂质。版权所有（C）2005，JPO＆NCIPI

7. 发明专利

JP2003311433A Method for evaluating liquid metal embrittlement crack during seam welding of galvanized steel sheet 审中-公开
标题翻译：钢板焊缝焊接液体金属破裂裂纹的方法
公开(公告)号：JP2003311433A
公开(公告)日：2003-11-05
申请号：JP2002113984
申请日：2002-04-16
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAMAYA HIDEKI , KODAMA SHINJI , MIYAZAKI YASUNOBU , MIZUHASHI NOBUO
IPC分类号： B23K13/01 , B23K13/00
摘要： PROBLEM TO BE SOLVED: To provide a method which can quantify the liquid metal embrittleness crack during seam welding of galvanized steel sheets, such as seam welding of a steel tube using the galvanized steel sheets by a simple method and can evaluate the liquid metal embrittleness crackability of steel products.
SOLUTION: The method for evaluating the liquid metal embrittleness crack during seam welding of the galvanized steel sheets comprises butting the galvanized steel sheets having galvanizing layers on either or both surfaces against each other, then exerting an upset to the butt zone and welding the same under electrical heating, air cooling the steel sheets after the end of the electric heating, loading the butt zone with a tensile stress of ≥20 to ≤80% of the tensile strength of the steel sheets at a temperature of a weld HAZ zone above the melting point of the galvanizing layers and below the Ar
3 transformation point of the steel sheets, then measuring the thickness of the embrittleness layer in the weld HAZ zone and evaluating the liquid metal embrittleness crack during seam welding of the galvanized steel sheets in accordance with the ratio of the embrittleness layer thickness to the sheet-metal gage of the steel sheets.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种能够定量镀锌钢板的缝焊过程中的液态金属脆性裂纹的方法，例如通过简单的方法使用镀锌钢板的钢管的缝焊，并且可以评估液体钢铁产品的金属脆性破裂性。解决方案：用于评价镀锌钢板的缝焊过程中的液态金属脆性裂纹的方法包括将两面或两面具有镀锌层的镀锌钢板彼此对接，然后对对接区施加镦锻并焊接在电加热的同时，在电加热结束后对钢板进行空气冷却，在焊接HAZ区的温度下，将钢板的拉伸强度为≥20〜≤80％的拉伸应力加载到对接区在镀锌层的熔点以上，低于钢板的Ar 3 相变点，然后测量焊缝HAZ区的脆性层的厚度，并评估缝焊过程中的液态金属脆性裂纹的镀锌钢板根据脆性层厚度与钢板的金属板的比例。版权所有（C）2004，JPO

8. 发明专利

JP2010105045A Method for producing electric resistance welded steel pipe 有权
标题翻译：生产电阻焊钢管的方法
公开(公告)号：JP2010105045A
公开(公告)日：2010-05-13
申请号：JP2009230811
申请日：2009-10-02
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAMAYA HIDEKI , HIROTA YOSHIAKI , MIZUHASHI NOBUO , YAMAMOTO KAZUTO , MIYAGAWA TAKASHI , WATANABE FUMINORI
IPC分类号： B21C37/08 , B23K13/00 , B23K13/02
摘要： PROBLEM TO BE SOLVED: To provide a method for producing an electric resistance welded steel pipe, in which both of a welding defect and a cold-weld defect can be prevented.
SOLUTION: In the method for producing an electric resistance welded steel pipe, while a steel plate 1 is molded into a pipe shape, the butted faces are subjected to electric resistance welding, wherein the butted faces are coated with carbon of 4 to 6 μm in thickness, and further, provided that: the product between a high frequency current and high frequency voltage at a critical welding velocity (V
0 )(m/min) calculated by equation (1) is defined as Qm(kW); a welding velocity as V(mm/min); 1/2 of the plate thickness of the steel plate as d(mm); a power feed distance as l(mm); and a V convergence angle as θ(° ), electric resistance welding is performed in the range of a heat input volume Q(W) prescribed based on equations (1) and (2): (1) V
0 =11,000×d
-0.4 ×l
-0.6 ×θ
-1.5 ; and (2) 0.9Qm×(V/V
0 )
0.6 0 )
0.8 .
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种能够防止焊接缺陷和冷焊缺陷两者的电阻焊钢管的制造方法。解决方案：在电阻焊钢管的制造方法中，在钢板1成型为管状的情况下，对接面进行电阻焊接，其中对接面涂覆有4〜并且进一步地，条件是：通过等式（1）计算的在临界焊接速度（V 0 ）（m / min）下的高频电流和高频电压之间的乘积是定义为Qm（kW）; 焊接速度为V（mm / min）; 钢板厚度的1/2为d（mm）; 供电距离为l（mm）; V收敛角为θ（°）时，根据式（1）和（2）规定的热输入量Q（W）的范围进行电阻焊接：（1）V 0 < SB> = 11000×D -0.4 ×L -0.6 ×θ -1.5 ; 和（2）0.9Qm×（V / V 0 ） 0.6 0 > 0.8 。版权所有（C）2010，JPO＆INPIT

9. 发明专利

JP2008212961A Method for manufacturing electric resistance welded tube 有权
标题翻译：制造电阻焊管的方法
公开(公告)号：JP2008212961A
公开(公告)日：2008-09-18
申请号：JP2007051396
申请日：2007-03-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAMAYA HIDEKI , FUKAMI SHUNSUKE , MIZUHASHI NOBUO , NAKAJI TOMOHIRO , MIYAGAWA TAKASHI , ASAHI HITOSHI , ISHIZUKA TETSUO , MUKAI MICHIAKI , HASEGAWA NOBORU
IPC分类号： B23K13/00 , B21C37/08 , B23K101/06 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing an electric resistance welded tube in which an amount of weld heat input can be controlled without receiving the influence of a molding fluctuation and measurement error, and the occurrence of a cold-weld defect in the electric resistance welded tube due to heat input deficiency during welding can be stably suppressed.
SOLUTION: When a belt-like steel sheet 1 of a sheet thickness t (mm) is formed in a cylindrical shape and is welded by forming molten metal in a butt part on condition that a butt angle ϕ satisfies expression (A), the butting point including the at least molten metal and its neighborhood are imaged, and when the welding direction is set as x coordinate and the weld point at non-melting time as an origin (x=0) based on the obtained image data, the amount of the heat input is so controlled that the position of the weld point x is set to ≤-2.0 mm.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种制造电阻焊管的方法，其中可以控制焊接热量的输入量而不受到模制波动和测量误差的影响，并且发生冷焊能够稳定地抑制焊接时的热输入不足导致的电阻焊管的缺陷。解决方案：当将板厚度t（mm）的带状钢板1形成为圆柱形并通过在对接部分中形成熔融金属（对接角度满足表达式（A））进行焊接时，成像包括至少熔融金属及其附近的对接点，并且当焊接方向被设置为x坐标并且基于获得的图像数据将非熔化时间的焊接点作为原点（x = 0）时，控制热输入量使焊点x的位置设定为≤-2.0mm。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JP2006088220A Electric welded steel tube manufacturing method 审中-公开
标题翻译：电焊钢管制造方法
公开(公告)号：JP2006088220A
公开(公告)日：2006-04-06
申请号：JP2004280220
申请日：2004-09-27
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： FUKAMI SHUNSUKE , HAMAYA HIDEKI , MIZUHASHI NOBUO
IPC分类号： B23K13/08 , B23K13/00 , B23K101/06 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide an electric welded steel tube manufacturing method for manufacturing the electric welded steel tube having excellent welding quality while consistently suppressing generation of cold junction failure of an electric welded steel tube due to insufficient heat input during the welding by estimating the situation of generation of the cold junction failure during the welding with high accuracy from the result of operation and performing the on-line control of the welding heat input based on the instantaneous variation of the impedance when welding the electric welded steel tube.
SOLUTION: In the electric welded steel tube welding method, the welding current I and the welding voltage E are measured at the predetermined time interval below 10 seconds, the time variation ΔI of the welding current I and the time variation ΔE of the welding voltage E are respectively obtained, and then the time variation ΔZ of the impedance defined by the formula ΔZ=ΔE/ΔI is obtained. The welding heat input is controlled based on the time variation ΔZ of the impedance so as to obtain the electric welded steel excellent in welding quality.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种电焊钢管的制造方法，其制造具有优良焊接质量的电焊钢管，同时一致地抑制焊接钢管由于焊接时输入不足导致的冷接头故障的产生通过从焊接结果的高精度估计焊接时发生的冷端故障的情况，并且在焊接电焊钢管时，基于阻抗的瞬时变化，进行焊接热输入的在线控制。解决方案：在电焊钢管焊接方法中，焊接电流I和焊接电压E在10秒以下的规定时间间隔，焊接电流I的时间变化量ΔI和时间变化量ΔE 分别获得焊接电压E，然后获得由公式ΔZ=ΔE/ΔI定义的阻抗的时间变化ΔZ。基于阻抗的时间变化ΔZ控制焊接热输入，以获得焊接质量优异的电焊钢。版权所有（C）2006，JPO＆NCIPI

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